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After that point you may see many spoilers for this great game, proceed with caution.
Silksong will require at least 2 full playthroughs in order to get all achievements, so I strongly recommend for your first one just to experience the game by yourself and only reference this guide if you are stuck or have already finished the story for the first time.

As for starters, find Shakra and buy a quill, compass, and maps to ease navigation. She is located shortly after the first village, "Bone Bottom". Ascend to the next large room and turn left, you will hear a lovely song - that's where you should go.

Prices are as follows:
• Quill - 50 Rosaries
  
• Compass- 70 Rosaries
  
• Mosslands Map - 40 Rosaries
  
• The Marrow Map - 50 Rosaries
  
• Bench Pins - 60 Rosaries
  
• Bellway Pins - 60 Rosaries
  
• Shell Marker - 40 Rosaries

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If you find yourself lacking in rosaries, here is one of the best spots to farm in the early to mid-game, it is located right before Bellway in the Marrow. Each run will take about 10 seconds and give you 10 rosaries. Sit on a bench --> kill the first two mobs to your left --> reset at the bench.

Farm Route Gif[imgur.com]

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A great spot to farm in mid-game is near Halfway Home, sit on a bench in the tavern --> move east, kill a group of 3 monsters --> Get back to the bench. Rinse and repeat. One run should give you about 18 rosaries and take around 12 seconds, which is much better than the previous spot.

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Best spot to farm in act 3 is located in the top-left part of the Choral Chambers, this spot will give you about 68 rosaries every 20 seconds, which is almost 3 times more than previous one. Sit on a bench right before entering High Halls area --> move to your right --> kill group of enemies --> get back to the bench. By this time you should know the drill. Good luck with your farming :)

I personally prefer the following build when farming, but the only essential tools here are:

1. Thief's mark
   
2. Cogfly
   
3. Barbed Bracelet
   
4. Silkspeed Anklets

But aside from them you can pick whatever tool you like and it should be fine.

Equipped
Acquire your first Tool
The first tool that I got was shard pendant but any other will also trigger this achievement. At the end of a path, there will be a long drop-down, be sure to hug left wall or you can miss it. If you fail recovery path will be long.

Bound
Bind your first Silk Skill
Your first skill will be Silkspear which will help you to destroy web walls. To get it, simply interact with door at marked location.

Claimed
Claim your first Crest
The first crest is located at Hunters March and can be accessed straight away. Crests are used as hornet's different skill builds; they will change attacks, skills and healing effects to unlock any crests, you will have to complete challenge room with a platforming section followed by a mini boss.

Restored
Acquire 2 Spool Fragments
Spools are used to increase Hornet's mana pool, easiest spools I found are these two, routes are shown from the nearest stag stations.

Protected
Acquire 4 Mask Shards
These are the four first mask shards that I encountered, but you may get different ones, there are 20 in total scattered across the whole map. The first mask is sold by a merchant in Bone Bottom for 300 rosaries. To get the second one, you need the Cling Grip skill. Third one is located behind a hidden wall at the bottom right side of Wormways. To get the fourth one, you need Needlion skill to open the Weavenest Atla entrance door.

Granted
Grant your first wish
Wishes are the equivalent of quests in Silksong; probably the easiest one is given by the Moss Druid. You will need to collect 3 mossberries and bring them back to him.

For second mossberry you will either need a double jump or you can cheese it, there is flying enemy nearby, lure it close to the mossberry, then 1. jump --> 2. down strike --> 3. up strike

Resident
Acquire your own Bellhome
To get your own house in Bellhome, you need:
1. Complete the Bone Bottom repair wish where you need to gather 200 shell shards and bring them to the quest board in Bone Bottom.
   
2. Defeat Widow boss in Bellhome.
   
3. Complete Restoration of Bellhart wish in Bellhome, where you need to collect 250 rosaries.
   
4. Exhaust all dialogues with Pavo that is standing next to Bellways station, as a final conversation, he will give you a key. Sometimes you need to travel between locations to trigger next dialogue with him.
   
   
5. Get upstairs in the same location and enter locked building.
After that, in the Bellhome shop, you can get furniture for your new luxury apartment.

Entwined
Hidden achievement: Bind Eva
To get this one, you will need to collect 6 Crests, for their locations check the "Consumed" achievement section. There are 20 memory lockets in total, but you only need to collect and use 17 of them. Then speak to Eva and you will get Sylphsong. List of upgrades that Eva will give you and when to speak with her:
Reward name
How to unlock
What upgrades
Hunter Crest upgrade
Speak to Eva for the first time
After you deal 6 sequential attacks you will get around 8 additional damage to you attacks, once you get hit the buff is removed
Yellow Tool Vesticrest
Use 3 Memory Lockets
Slot for yellow tool independent of a crest selected
Blue Tool Vesticrest
Use 6 Memory Lockets
Slot for blue tool independent of a crest selected
Hunter Crest Upgrade #2
Use 12 Memory Lockets
Extends max combo from 6 to 12 attacks and increase attack damage for an additional 8 points (16 damage at max combo)
Sylphsong
Use 17 Memory Lockets and unlock 6 Crests
Ability to regenerate silk while sitting on a bench

Trail's End
Grant Shakra's wish
The prerequisite for this wish is finding Shakra in every location and buying all maps from him, locations are marked with a green star on the map. After that, you will get access to Trail's End wish in Bellhart. The final encounter with Shakra is located in the top-right part of Bilewater, to get there, you will need double jump.

Glutton
Satiate the Grand Gourmand
To complete this achievement you need to finish Great Taste of Pharloom wish, it is given by Loyal Mergwin in Choral Chambers.
1. To get Mossberry Stew simply get back to Moss Druid and talk to him
   
2. Vintage Nectar is located in Halfways Home's cellar, you need to buy access to it for 480 rosaries from the tavern keeper.
   
3. Pickled Muckmaggot is given to you after you defeat Disgraced Chef Lugoli in marked location.
   
4. Courier's Rashed is granted by completing the wish from Courier brothers in Bellhard. You need to speedrun the path to Loyal Mergwin without getting hit too much. If brothers are not present at the marked location, you first need to complete the quest from Bellhart's board called "My Missing Brother", missing person will be located in Sinners Road on top of location with cage icons.
   
   
5. Crustnut is located in Sands of Karak behind hidden walls, just follow the path and break every spike wall on your way.

Liberated
Defeat the Bell Beast
The Bell Beast is found at the entrance to Mosshome (top-left of The Marrows). After getting the Silkspear skill, you head toward the (>>>) sign located there. Then, you simply use the skill to get rid of the silk and fight the boss. The Bell Beast is the Silksong equivalent of the Stag Stations from Hollow Knight.

Pharloom's Welcome (Missable)
Defeat Lace in Deep Docks
To find Lace in Deep Docks, simply head right along the bottom of The Marrows. At some point, you'll see a Bench sign pointing down-right. Climb the two floating platforms next to it and unlock the gate. Lace is located right beyond the gate, on the platform located in lava. Defeating Lace unlocks Far Fields. If you ignore this boss fight and go on with your game until the moment when you speak to Lace in the citadel, this achievement will be missed.

Servant
Defeat Fourth Chorus
After unlocking Far Fields, head 3 rooms to the right and drop down onto the bone. Head right and cross the platforms floating on lava. You can't fight Fourth Chorus until you complete the Flexile Spines wish. The character who gives this wish is located at the top of the next room inside a house. With Swift Step, you simply head to the rightmost part of that room. Then, climb up the platforms to the left. For the Wish, you fight the balloon-like enemies in the room to the right (then attack the projectiles it spews to collect the associated item). Complete the Wish, then go left.

Fanatic
Defeat Widow
Boss is located in Bellhart, but in order to reach him you must visit Shellwood and get Cling Grip first. That will give you ability to wall jump. After you defeat this boss, you will get Needolin, a skill that will open doors that are shaped like a spider mask. A great boss fight awaits! I recommend following bench sign to the left from the boss arena before entering boss room.

Judge
Defeat the Last Judge
Last Judge is located at the end of Blasted Steps. Prior to accessing this boss, you will need to get Needolin and activate 5 different benches with large bells over them.Don't forget to use save bench before the boss fight. Defeating Last Judge will open Citadel and start act 2. You wont get access to previous locations for some time.

Last Dance
Defeat the Cogwork Dancers
You must defeat Last Judge first to open Citadel. Then complete part of Underworks. The boss room is located in the middle of the Citadel. Defeating them will open Cogwork Core location

Tragedian (Optional)
Defeat Trobbio
Trobio is located in the Whispering location, which can be accessed only after the Cogwork Dancers fight.

Grey Ghost (Optional)
Hidden achievement: Defeat Phantom
This boss is located at the top of Exhaust Organ in Bilewaters. Once you get close to it, you will first enter the mist labyrinth location, where you need to search for white butterflies and use the Needolin skill on them, they will guide you to exit, which you should take. You will have to do that for 4-5 rooms before you will get out of the labyrinth. If you take the wrong path, you will have to start over.

Heretic (Optional)
Hidden achievement: Defeat First Sinner
To reach this boss, you first need to get the Key of Heretic. It is located at top part of the Slab location, don't forget to grab the Key of Indolent on your way, it will open few useful doors in the Slab.

After you get the Key of Apostate, go to the Slab and open locked door on one of the bottom floors.You will get Rune Rage as a reward.

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There are also Key of Apostate that is used in the Slab area. Here is the route on how to get it.

Harmonious
Learn the Citadel's Threefold song
To complete this achievement, you need to defeat Cogwork Dancers and speak to the statue in their room. Then collect 3 parts of song (they can be taken in any order) and get back to the Cogwork Dancers' room.

• The first one is located at the end of High Walls, you must complete battle at the Forum to get there.
  
• The second one is in the Whispering location, after acquiring it, you can visit Vaultkeeper Cardinius for additional lore and music. :)
  
• The third one is located on the last floor of the Cogwork Core, you must solve a simple puzzle to get it, just align the notes so they connect from bottom to top for each pillar.
  Solution for this puzzle: just hit each pillar from bottom to top specified amount of times (this will work only from default position).
  
  1st

  2nd

  3rd

  4th

  1-3-3-3

  2-0-0-3

  0-1-1-1

  1-1-0-2
  
  

White Knight
Defeat Lace in the Cradle
The fight will happen right after you complete Citadel's Threefold song. Check Harmonious achievement for more information. Boss will unlock The Cradle

Weaver Queen
Hidden achievement: Defeat Grand Mother Silk and bind her power
Boss can be accessed only after you complete Citadels Threefold song and defeat Lace in Cradle. Check the harmonious achievement section for more information.

Twisted Child (Missable)
Hidden achievement: Defeat Grand Mother Silk while cursed
To get this achievement, you need to complete two wishes from Greyroot, Rite of the Pollip and Rite of Rebirth, he's located in Shellwood. For the first one, you have to gather 6 pollip hearts and then get back to Greyroot.

After that he will ask you to get Twisted Bud, it's located right after the Whispering Vaults drop down to Bilewater. Take it and bring it to Greyroot. Then you proceed to talk with him untill he curses you and you spawn in a new location.

From that point just go to Grand Mother Silk location and try to beat her while cursed. You won't be able to heal or use skills, trinkets or any other stuff. Good luck with that :)

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If you already removed the curse in your save, you can either do this achievement in another playthrough or reverse your current save to a state where you haven't yet removed the curse by pressing the circular button under the save file.

Snared Silk
Hidden achievement: Defeat Grand Mother Silk and entrap her with the Soul Snare
To get this achievement, you will need to complete Trail's End, collect at least 25 fleas and move the flea caravan three times so it ends up in Fleatopia, and complete almost every wish on boards in Songclave, Bonebottom, Bellhard, and The Citadel. After that you can get the wish called Silk and Soul from the caretaker in Songclave. Then you will need to collect 4 souls:
1. Maiden's Soul, before getting this soul, you need to sit on a bench in Bone Bottom and defeat Skull Tyrant that will spawn there.
   
2. Hermit's Soul, this area can be accessed from Bellhart Bellway, there is a breakable wall to the right from Bellbeast.
   
3. Seeker's Soul, You will need to defeat the arena battle right before this soul.
   
4. Snare Setter, to get in this area open the door with Needolin and grab Snare Setter.
After that, talk again with the caretaker in Songclave and proceed to the Grand Mother Silk battle. Getting this achievement will start act 3 of a game.

Bonded
Hidden achievement: Learn the Beastling Call
You will get this achievement for defeating Bell Eater. To access him, travel on any of the Bellway stations and jump into the hole that will appear near you. After beating him you will learn Beastling Call, that will give you ability to teleport back to Bellwaystations from almost any part of the map

Diva
Hidden achievement: Defeat Skarrsinger Karmelita
One of the three bosses that you need to defeat during the Old Hearts wish. Start from the Marrow and move to the right. Path from Deep Docks Bellway station is blocked, so use the Marrow instead. Then move to the right until you reach the large statue in Hunters March, there use Silk Soar to reach the new room.

Tyrant
Hidden achievement: Defeat Crust King Khann
One of the three bosses that you need to defeat during the Old Hearts wish. He is located in the end of the Sands of Karak location. You will have to defeat Raging Conchfly first, and then you can proceed to Coral Tower. There you will have to fight 3 small arenas before reaching Crust King Khann.

Seed
Hidden achievement: Defeat Nyleth
One of the three bosses that you need to defeat during the Old Hearts wish. Located in secret location under Grand Gate. Before Nyleth you will have to defeat Shrine Guardian Seth then proceed to Nyleth and use Elegy of the Deep.

Lamenter
Hidden achievement: Defeat the Clover Dancers
To get this achievement, you need to save Green Prince from jail in Sinners Road using a simple key. Then talk to him in the Cogwork Dancers arena. For next step you need to be in act 3 you can find him on the right side of Craw Lake. To get the map of Verdania proceed to your right, before using Elegy of the Deep on Green Prince, and at the end of the path, there will be a map. To get access to Clover Dancers, you will need to collect 2 flower essences, 3 statue essences, sacred shrine and defeat Palestag. Once everything is collected, you can get to Green Prince's Home.Here is a great video guide on the full Green Prince questline if you are still confused.https://www.youtube.com/watch?v=-cPlR22x-H4&ab_channel=GameGuidesChannel

Remembrance
Hidden achievement: Claim the Everbloom from within a distant memory
After you collect 3 hearts for the Old Hearts quest, come back to snail shamans in Moss Grotto. After you complete the dream sequence, you will get this achievement. For hearts location check Diva, Tyrant, Seed and Lamenter achievements sections (you only need 3 of them).

Hero's Call (Optional)
Hidden achievement: Defeat Lost Garmond
Accept Hero's Call wish from the Bellhart quest board, then go to Blasted Steps Bellway station and then follow Zaza until you reach Lost Garmond. For wish to appear on board, you need to encounter Garmond and Zaza several times around Greymoor and Shellwood in act 3, he can also be encountered in Choral Chambers but I don't think that it is required to meet him there.

Rest in Peace, Brave Warrior.

Fatal Resolve (Optional)
Hidden achievement: Defeat Pinstress
Accept Fatal Resolve wish from the Bellhart quest board, travel to the blasted steps and find Pinstress in large house right before the ascend to Sands of Karak, after that, travel to the Slab Bellway and proceed to the Mount Fay location. There, Pinstress will be sleeping, kick him a few times to wake up and talk to him.

Passing of the Age
Hidden achievement: Grant the Herald's wish
To complete this achievement, you will need to find Riddle Tablet in the Putrified Ducts, you need the Silk Soar ability to reach it. Then meet Mister Mushroom 7 times across the whole of Pharloom and play Needolin skill for him to appear, and after that, finish the game with any ending.
1. In Moss Grotto, to the right of the snail shaman's shrine.
   
2. Above Bone Bottom.
   
3. Far Fields before Needolin gate.
   
4. Above Towers in Greymoor.
   
5. In the Slab, same area where you fought the first sinner.
   
6. At the top of Mount Fay, where you got your double jump.
   
7. Above Grand Mother Silk arena, where you got Pale Nails. There will be a large platforming section where you will need to use every movement skill in the game. Some sort of Path of Pain from original Hollow Knight, although much shorter and easier :(


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Sister of the Void
Hidden achievement: Defeat Lost Lace and free Pharloom
After completing the Old Hearts, you will get the Last Dive task. Proceed to the Abyss area and defeat the final boss, also known as Lost Lace.

Connected
Open all of Pharloom's Bellways
Bellways are fast travel points in the world of Silksong, there are 12 of them in total scattered across the whole map. When you get closer, Bellway station signs with two arrows (>>) will start appearing, directing you to the station itself.
1. Bone Bottom is your first station that is available from the get-go.
   
2. The Marrow, to get this one, you will need to defeat the Bellbeast boss in the same location.
   
3. Deep Docks, to get this one, run across the bottom part of The Marrow to the east side, and you will find Bellway station.
   
4. Far Fields, continue to the right from Deep Docks, and you should see it in no time.
   
5. Greymoor, to get here you will need to ascend Far Fields using the Cloak ability that you craft in the bottom-right corner of Far Fields by completing "Flexile Spines" wish there.
   
6. Bellhart, go to the west from Greymoor.
   
7. Shellwood, right after Bellhard you will get to this location.
   
8. Blasted Steps is the last Bellway station before entering act 2, you will need Cling Grip ability to get here.
   
9. The Slab, aside from the shown path, there is another way to get into the Slab. On the east side of the Bilewater area, there are big flies with cages on their backs, if they manage to hit you with their cage attack, you will get transported to Slab as a prisoner.
   
   
10. Grand Bellway most important Bellway station, as it connects Bellway and Ventrica systems.
    
11. Bilewater long path from Greymoor to this station, I got this very late into the game.
    
12. Putrified Ducts, for this one you will need a double jump ability, also known as Faydown Cloak

Transported
Open all of the Citadel's Ventrica Stations
Ventrica Stations are substitutions for Bellways inside the Citadel, so first you need to beat The Last Judge to enter the second act, there are 7 stations in total that you need to find.
1. Terminus is opened once you buy any other station.
   
2. To get to the Memorium station, you need double jump ability, also known as Faydown Cloak or you can use Beast Crest, then charge attack --> jump --> release charge and you should get enough high to reach the platform to enter this area.
   
3. To get to High Walls station, you need Clawline skill.
   
4. The fastest way to the First Shrine is accessible once you beat the Clockwork Dancers, or you can detour around the citadel to get there, but it's a much longer route.
   
5. Choral Chambers is probably first or second that you will reach, it's located right after the Underworks location.
   
6. Grand Bellway is the most useful station, as it connects the Ventrica system to Bellway stations.
   
7. Underworks is probably the first or second that you will reach. It's located in the middle of the Underworks location, which is the first location you gain access to in Citadel.

Cartographer
Acquire a map of each area
There are 29 maps in total, but only 28 required for the achievement. Choral Chambers has two spots where you can buy it (numbers 14 and 22).
1. Bone Bottom, sold by Shakra for 40 rosaries.
   
2. The Marrow, sold by Shakra for 50 rosaries.
   
3. Deep Docks, sold by Shakra for 50 rosaries.
   
4. Hunter's March, sold by Shakra for 70 rosaries.
   
5. Far Fields, sold by Shakra for 50 rosaries.
   
6. Greymoor, sold by Shakra for 70 rosaries.
   
7. Sinner's Road, sold by Shakra for 90 rosaries.
   
8. Bellhart, sold by Shakra for 40 rosaries.
   
9. Shellwood, sold by Shakra for 70 rosaries.
   
10. Wormways, sold by Shakra for 70 rosaries.
    
11. Blasted Steps, sold by Shakra for 70 rosaries.
    
12. Grand Gate, sold for 40 rosaries.
    
13. Underworks, found on the left side of the Underworks.
    
14. Choral Chambers, (first location) sold for 70 rosaries.
    
15. The Slab, found inside a secret room on a corpse.
    
16. Mount Fay, sold by Shakra for 40 rosaries.
    
17. Sands of Karak, sold by Shakra for 90 rosaries.
    
18. High Halls map requires Clawline, sold for 70 rosaries.
    
19. Cogwork Core, after defeating Cogwork Dancers, found in a room above the bench.
    
20. Memorium requires Faydown Cloak or Beast Crest (use charge attack to gain additional high) to access this location, sold for 70 rosaries.
    
21. Whispering Vaults, sold for 70 rosaries.
    
22. Choral Chambers, (second location) sold for 70 rosaries.
    
23. Putrified Ducts, found at the top of a room, let yourself be grabbed by Barnak's tongue.
    
24. Bilewater requires Faydown Cloak to get there, sold by Shakra for 90 rosaries.
    
25. Verdania requires being in act 3, go past the Green Prince till the end to find the map.
    
26. The Cradle, sold for 70 rosaries.
    
27. Weavenest Atla requires Needolin to get there, hit two glowing cylinders for the map to appear.
    
28. The Abyss, found at the bottom part of the location.
    
29. Whiteward, sold for 70 rosaries.

Regenerated
Acquire all Silk Hearts
There are 3 Silk Hearts in total, they give you the ability to regenerate a small portion of your mana with time.

1. Defeat the Bellbeast in The Marrow, if you have trouble finding him, check Liberated achievement section.
   
2. Defeat Lace in The Cradle, if you have problems accessing this boss, check White Knight achievement section.
   
3. Defeat The Unraveled in Whiteward, find white key first, which is located in the eastern part of Whiteward and then you can unlock the elevator above the boss room.
   

Woven
Bind all Silk Skills
There are 6 Silk Skills in total, to get all of them, you will need to get to act 3 in the first hand.
1. Silkspear, acquired at the start of a game.
   
2. Thread Storm, located over Craw Lake you will need Drifters Cloak to get there.
   
3. Sharpdart, you need Needolin and a simple key to open doors in the Wormways.
   
4. Cross Stitch, you will get it once you defeat Phantom, for more info, check the Grey Ghost achievement section.
   
5. Rune Rage, located in the Slab after defeating First Sinner, check Heretic achievement section for more info.
   
6. Pale Nails can be accessed only in act 3. You will need the Silk Soar skill, once you get it, go back to where you fought with Grand Mother Silk.

Consumed
Claim all Crests
There are 7 Crests in total, one of them is Hunters Crest, which you own by default (yes, it counts).
1. Beast Crest, located in Hunter's March, simply complete the arena, and the Crest is yours.
   
2. Reapers Crest, located in Greymoor, complete arena on marked location.
   
3. Wanderer Crest, located in Bonegrave, same as the first two, just complete the arena.
   
4. Witch Crest, first you need to complete the Rite of Rebirth wish, then the Infestation Operation, and after that you will get the Witch Crest. For more information check the Twisted Child achievement.
   
5. Architect Crest, first you need to buy the Architect's Key from the vendor right before this chapel. She will start selling it for 110 rosaries but only once you get 25 tools in total.
   
6. Shaman Crest, you need to be in act 3 and get the Silk Soar skill. Located inside the Ruined Chapel where snail shamans stay.

Masked
Acquire all Mask Shards
Every fourth mask shard will permanently increase your max health. There are 20 shards in total.
• 1. Sold in Bone Bottom for 300 rosaries.
  
• 2. Require Cling Grip.
  
• 3. Require Drifter's Cloak.
  
• 4. Require Drifter's Cloak.
  
• 5. Behind a breakable wall in the bottom part of the Wormways.
  
• 6. Require Needolin.
  
• 7. After platforming section.
  
• 8. Swift Step, Clawlin, and Faydown Cloak to get there.
  
• 9. After completing Savage Beastfly wish.
  
• 10. After completing The Hidden Hunter wish (act 3).
  
• 11. After completing the Dark Hearts wish (act 3).
  
• 12. Require Faydown Cloak and Clawline.
  
• 13. After completing Fastest in Pharloom wish (win 3 races in this location).
  
• 14. Get here after the Cogwork Dancers battle.
  
• 15. Sold in Songclave for 750 rosaries.
  
• 16. Breakable ceiling.
  
• 17. Require Clawline.
  
• 18. Require the Apostate key.
  
• 19. Require Silk Soar.
  
• 20. Require Faydown Cloak.

Extended
Acquire all Spool Fragments
Every 2 Spool Fragment will increase your maximum mana pool, there are 18 spools in total that you have to collect.
• 2. Require Clawline.
  
• 4. Require Clawline.
  
• 5. Complete the My Missing Courier quest, then it will be added to Bellhard's shop for 270 rosaries
  
• 6. Require Cling Grip.
  
• 7. Sold for 680 rosaries.
  
• 8. Collect 14 fleas and proceed with the caravan quest.
  
• 9. At the top part of the grand gate after the platforming puzzle.
  
• 11. Behind a breakable wall, on the left side of a pit.
  
• 13. Complete Balm for the Wounded wish first.
  
• 15. Require Cling Grip.
  
• 16. Require Faydown Cloak.
  
• 17. Require Faydown Cloak and Clawline.
  
• 18. Sold in Songclave for 500 rosaries after you complete The Lost Merchant wish.

Arsenal
Acquire all Tools
You need to collect 51 tools for this achievement, none of them are missable. The list is written in the same order as shown in the game, from left to right. If the tool can be upgraded, any version of it will count toward this achievement. There are more tools in the game than required, for example. I got the achievement without ever finding Snare Setter.
Red tools:
1. Straight Pin, found in the Marrow above Grindle's Cell.
   
2. Threefold Pin, found in a secret cave above Craw Lake.
   
3. Sting Shard, crafted by Forge Daughter for 140 rosaries and one craftmetal.
   
4. Tacks, reward for completing Roach Guts wish in Sinner's road.
   
5. Longpin, in the Shellwood area, is behind the pink wasp nest.
   
6. Curveclaw, purchased, for 140 rosaries from Mottled Skarr --> Curvesickle
   
7. Throwing Ring, reward for completing Trail's End wish.
   
8. Pimpillo, crafted in Yarnaby's Bellhome in Greymoor, requires one craftmetal.
   
9. Conchcutter, found in Coral Tower cave at Sands of Karak area.
   
10. Silkshot I / Silkshot II / Silkshot III, after finding the Ruined Tool in Bilewaters, bring it to Forge Daughter, Twelfth Architect, or Mount Fay's top part for I, II, or III versions.
    
11. Delver's Drill, found on a table in the Underworks area.
    
12. Cogwork Wheel, crafted by Architect in Underworks area for craftmetal and 360 rosaries.
    
13. Cogfly, requires one craftmetal, can be crafted in the High Halls area.
    
14. Rosary Cannon, found on a table in the Forum area.
    
15. Voltvessels, found in the Memorium's top-right part.
    
16. Flintslate can be found in the Deep Docks.
    
17. Snare Setter (Optional), can be found in Weavenest Atla above the bench.
    
18. Flea Brew, reward for finding 5 fleas and talking to Fleamaster Mooshka.
    
19. Plasmium Phial, reward for completing Alchemist's Assistant wish in Wormways.
    

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    Blue tools:
    
20. Druid's Eye -- > Druid's Eyes, reward for completing the Berry Picking wish, for the upgraded version, find every mossberry in location.
    
21. Magma Bell, crafted by Forge Daughter for one craftmetal and 110 rosaries.
    
22. Warding Bell, found on a platform in the Far Fields.
    
23. Pollip Pouch, reward for completing the Rite of the Pollip wish in the Shellwood area.
    
24. Fractured Mask, purchased from Mottled Skarr in the Hunter's March area for 260 rosaries, if you are in act 3 you can find it in the room above it.
    
25. Multibinder, sold by Frey in Bellheart for 880 rosaries after completing My Missing Courier wish.
    
26. Weaverlight, reward for defeating Moss Mother in Weavenest Atla.
    
27. Sawtooth Circlet, crafted by the Twelfth Architect in the Underworks for one craftmetal and 230 rosaries.
    
28. Injector Band, found in the Whiteward area on a table.
    
29. Spool Extender, sold by Jubilana in Songlave for 720 rosaries.
    
30. Reserve Bind, reward for beating the Second Sentinel boss in High Halls.
    
31. Claw Mirror --> Claw Mirrors, reward for beating Trobbio in Whispering Vaults, the upgraded version is given for beating Trobbio a second time.
    
32. Memory Crystal, found behind a wall of ice in the Mount Fay.
    
33. Snitch Pick, sold by Grindle for 740 rosaries.
    
34. Volt Filament, a reward for beating the Voltvyrm boss in Sands of Karak.
    
35. Quick Sling, found behind a breakable ceiling in the Bilewater area.
    
36. Wreath of Purity, found in Putrified Ducts.
    
37. Longclaw, reward for completing the Broodfeast wish in Putrified Ducts.
    
38. Wispfire Lantern, reward for beating the Father of the Flame boss in the left part of Wisp Thicket.
    
39. Egg of Flealia, reward for completing Lost Fleas wish in the Marrow.
    
40. Pin Badge, a reward for beating Pinstress in Mount Fay, available only in act 3.
    

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    Yellow tools:
    
41. Compass, sold by Shakra for 70 rosaries
    
42. Shard Pendant, found in the Marrow.
    
43. Magnetic Brooch, sold by Pebb in Bone Bottom for 120 rosaries.
    
44. Weighted Belt, sold by Mort in Pilgrim's Rest for 160 rosaries, if you are in act 3 you can go to your left, and in a large vertical location, there will be his corpse with this belt.
    
45. Barbed Bracelet, found in Sinner's Road from a bug corpse.
    
46. Dead Bug's Purse, found in the Wormways area.
    
47. Shell Satchel (Steel Soul), found in the same place as Dead Bug's Purse.
    
48. Magnetic Dice, beat Luble in a minigame a few times in a row, or buy it from Grindle in act 3.
    
49. Scuttlebrace, crafted for one craftmetal and 140 rosaries from Twelfth Architect in Underworks.
    
50. Ascendant's Grip, sold by Jubilana in Songclave for 350 rosaries after completing The Wandering Merchant wish.
    
51. Spider Strings, sold by Jubilana in Songclave for 320 rosaries after completing The Wandering Merchant wish.
    
52. Silkspeed Anklets, obtained after sprinting full room in Weavenest Cindril area located in Far Fields.
    
53. Thief's Mark, sold by Grindle for 350 rosaries, located in Blasted Steps.


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Video with every tool location:https://www.youtube.com/watch?v=EaGJ916LyZo&ab_channel=LunarGaming

Flea Finder
Rescue half of Pharloom's lost fleas
Collect 15 fleas to get this one. They are scattered across the whole map, usually behind platforming sections or hidden walls. They work as an alternative to Grubs from the original Hollow Knight. For locations, check the Fleafriend achievement.

Fleafriend
Rescue all of Pharloom's lost fleas and receive their final gift
There are 30 fleas in total. After you catch them all, you need to speak with caravan master at Fleatopia, you will need to proceed with his quest, staring from his first location at the Marrow (5) -- > Greymoor (10) --> Grand Gate (20) --> Fleatopia (30), the number shows how many fleas you need to move the caravan to the next location.
• 1. Required Swift Step.
  
• 2. Secret room behind Bellway station.
  
• 5. Required Clawline
  
• 7. Required Drifters Cloak and Cling Grip, get there from are below.
  
• 9. Required Cling Grip,
  
• 11. At the end of the secret room.
  
• 13. Reached from top side of the tower.
  
• 16. Can be accessed only from the Wisp Thicket area.
  
• 19. Activate the fan at the bottom of this location to access it.
  
• 20. Required Faydown Cloak, secret room above the bench.
  
• 21. Need to get the Key of Heretic first. Key is located in the same room, 3 floors higher.
  
• 22. Inside the Exhaust Organ there is a room that will lead you outside the organ; from there just jump to your left.
  
• 23. Required Cling Grip
  
• 24. Required Cling Grip, get there from the bottom part.
  
• 25. In a secret room behind a breakable wall at the top left part of a room.
  
• 26. Required Clawlline
  
• 27. Required Clawline, get there from Whispering Vaults.
  
• 28. Boss fight at top of Memorium.
  
• 29. Most important flea, after you find him, he will join the caravan and start selling the locations of missing fleas.
  
• 30. Secret room with traps.

Keen Hunter
Grant Nuu's wish
Get to Greymoor, there you will find a tavern called Halfway Home on the second floor. There will be a pink bug called Nuu, accept her wish and fill the journal with 100 entries. For this one, you only need to create an entry (kill the enemy once), while for the next achievement, you will need to fully fill the journal with all entries and master them. After you are done, come back to the same place and talk to her again.

True Hunter
Receive the Hunter's Memento
Complete all entries in Hunter's Journal, there are 237 in total but you only need to complete 230. Journal is granted by Nuu to complete his wish. He is located in the Halfway Home tavern on the second floor. You will have to kill every creature in the game to create an entry in the journal and then kill them a few more times to master their entry. After you complete 230 entries, come back to Nuu in Halfway Home and get your memento.For this case you can get the Farsight item and bring it to your Bellhome to see completion status live. It is located at the end of the Abyss location. Full list of optional enemies:
• Flintbeetle
  
• Palestag
  
• Summoned saviour (Required in steel soul mode)
  
• Shakra
  
• Garmond & zaza
  
• Lost garmond
  
• Lost lace
For each specific enemy location use Silksong Interactive Map[mapgenie.io]For additional information, you can check this Steam guide.https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3564597249

Completion
Achieve 100% game completion and finish the game
Complete the checklist below and finish the final boss to get this one. When you defeat him, you will see your completion percentage. Another way is if you pick up the Farsight item from the Abyss and bring it to your Bellhome, this way you will unlock the in-game completion tracker that will show you your completion percentage. You need to get 100% before defeating the final boss to get this achievement.

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List of things that give you a percentage toward 100% completion:

• Every charm (51). 1% for each charm, 51% in total.
  
• Every spool fragment (18). 1% for each Silk Spool, 9% in total.
  
• Every silk skill (6). 1% for each Silk Skill, 6% in total.
  
• Every ability (6). 1% for each ability, 6% in total. (faydown cloak is not counted but you need it to get Silk Soar)
  
• Every crest (6). 1% for each Crest, 6% in total.
  
• Every mask shard (20). 1% for each Ancient Mask, 5% in total.
  
• Every nail upgrade (4). 1% for each nail upgrade, 4% in total.
  
• Every tool pouch upgrade (4) 1% for each tool upgrade, 4% in total.
  
• Every crafting kit upgrade (4) 1% for each crafting kit, 4% in total.
  
• Every silk heart (3). 1% for each Silk Heart, 3% in total.
  
• Bind Eva after all crests are maxed out (use 18 memory lockets). 1% for binding Eva
  
• Acquire everbloom. 1% for getting Everbloom.

51 + 9 + 6 + 6 + 6 + 5 + 4 + 4 + 4 + 3 + 1 + 1 = 100% completion

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List of things that won't give you a percentage toward completion directly, but you still need to do them to get the rewards:

• Collect every flea (30), then move the caravan to Fleatopia and finish the Ecstasy of the End wish to get pale oil.
  
• Completing wishes (~45), the only wishes that you don't actually need are Passing of the Age, A Vassal Lost wish (Steel Soul exclusive) and wishes given by couriers in Bellhard, you will need to complete only "Courier's Rashed" from them to get the Glutton achievement. Wishes themself are not giving you any percentage, although you will need to complete most of them for their rewards and access to act 3.
  
• Collecting maps (28). You will still need to buy all of Shakra's maps in all possible locations (14 areas outside of the Citadel) as a prerequisite for completing the Trails End wish.
  
• Collecting memory lockets (20). You will need to collect enough to bind Eva (18 lockets), the rest of the lockets are not mandatory.

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List of things that are not required towards 100% completion:

• Opening Bellway locations (10).
  
• Opening Ventrica stations (7).
  
• Completing Hunter's Journal (234).
  
• Collecting Mementos (8).
  
• Collecting cylinders (6).
  
• Filling materium in Bellhart home.
  
• Bosses themselves are not required. If defeating the boss won't give you anything from the list above then this boss can be skipped.

Speedrunner
Complete the game in under 5 hours
Time for speedrun achievements is counted by an in-game timer, so feel free to pause the game and check maps when needed, the in-game inventory stops time as well. You can also change your game language to Chinese, there is less text scrolling this way, and it could save you up to 3-4 minutes for this speedrun.

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Check guide below for a more detailed breakdown of the speedrun route. Using this guide, I managed to get under 4 hours on the first try while taking additional stuff to make it safer because I went for a speedrun and Steel Soul mode at the same time.https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3564886434

Speed Completion
Achieve 100% game completion and finish the game in under 30 hours
If you won't get this one in your first playthrough, I recommend using the Speedrunner achievement save as a starting point. For information on what you need for 100% completion, check the "Completion" achievement section. You can also change your game language to Chinese, there is less text scrolling this way, and it could save you up to 10 minutes across the full game span.

Steel Soul
Finish the game in Steel Soul mode
Steel Soul mode is opened once you beat the game at least once, alternatively, you can open it by inputting Up, Down, Up, Down, Left, Right, Left, Right in the extra section of the main menu.In Steel Soul mode you have only one life, if you die, your save file will get auto-deleted. I strongly recommend completing the game for 100% first. Exiting to the main menu is your best friend here, if you feel that there is a chance that you are going to die right now or your health falls below 2 points, better safe than sorry, just press escape and exit to the main menu, you will get spawned at the last bench with full hp. Also remember it's not a speedrun, take it slow and prioritise upgrading your character first (mask shards, spool fragments, etc.) I would recommend completing Souls Mode with Fractured Mask, which you can buy from a vendor in the Hunter's March. This mask will save you from death once before breaking, then you can sit on a bench to repair it.

Steel Heart
Achieve 100% game completion and finish the game in Steel Soul mode
Same as the Steel Soul achievement, but you will need to fully complete the game. The list of stuff counted toward 100% is mentioned in Completion achievement sectionIf you want to cheese this achievement you can create a backup of your file once in a while. Save files are located in \AppData\LocalLow\Team Cherry\Hollow Knight Silksong\(Your steam id), here you need to find a save file called user.dat with a digit corresponding to the save slot from 1 to 4. If you die, simply roll back to that save file by moving your previous backup here. Also you can check this step-by-step guide on completing Steel Soul mode:https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3568874345

Congratulations on completing Hollow Knight: Silksong. Hope this guide helps.
Also if there are any questions or suggestions let me know in a comment section :)

Additional list of people that helped with this guide creation: Waddledee

Great map: Silksong Interactive Map [mapgenie.io]
4K version of full Pharloom map: Full map download [drive.google.com]


If you are struggling with Steel Soul or Speed Completion achievements and you don't mind cheesing it, check out this guide:
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3575166235