Hi!
I made this guide to help you obtaing all achievements and reach 100% completion in the game. I will go over each of the 44 achievements you will need to deal with to reach the 100% completion and will try to do it as briefly as possible.

In summary, there are 44 achievements in total:

Easter Eggs
24 regarding secrets inside the titular game, that will appear in the little stickers notebook once you unlocked each one of them.


Boss fights
4 will unlock after defeating each one of the bosses.


Endings
3 for every ending after defeating (or not) the final boss of the game.


Miscellaneous
3 achievements that will unlock by interacting with objects of the room (one of them needing some specific action inside the game).

Retrieve the lost ring and return it to its owner

For this achievement you need to get the ring from one of the green creatures in this chamber. You will need the sword to kill it and be able to grab the ring.





Then walk through the maze with the spirit following you and reach the room on the left where the lady is and interact with her. After that, the achievement should appear.







Defeat the dragon in the tutorial

This one is self-explanatory. To get the achievement you need to kill the dragon, the only way possible is by using the sword against it.



This one can be done at the start of the game or afterwards after unlocking the sword in the Maze area.
The dragon is located in this room inside the beginning area:

Purify the corrupted tombstone

In the Village, there is a church with a graveyard to the southeast. Inside the church, there is a red cross that we will need to grab and take to the graveyard on the right.





Once there, you will see a glitching tombstone, drawing the cross next to it and making it touch the tombstone will purify it and a spirit will appear and fly away, giving you the achievement.







Pet your new four-legged friend

This one is easy. There is a dog between two houses. Once you approach it, press the interaction button (Space Bar on keyboard or X/A on gamepad) and the achievement will pop up.







Upgrade your sword to the next level

You can find the Sword in this room inside the Maze.



To unlock the magic door blocking you from the sword, you need to follow the solution inside a drawer that opens after you enter the solution in the ‘Guess Who?’ game board. For this you will have to leave 3 characters that have the following features:







The solution to the Sword Maze is given to you in paper inside the blocked drawer. You will need the purple bridge to solve the levers sequence.



After getting the sword from the Maze, you will need to take it back to the Village and give it to the blacksmith, the npc that says ‘The eternal task’ when you approach it.



It will hit the sword on the anvil and after 3-4 hits, it will transform from blue to yellow.





Help the Toymaker to finish his doll

As the achievement reads, you will need to gather the 5 parts scattered across the game and bring them to the Toymaker. The first one you can get is already inside the house where the Toymaker is.





You can find all the remaining parts in these locations:

Find the Butcher’s prey

Going west you will find the Butcher NPC holding a clever that will say “There’s No Meat Here”.





After he talks to you, a red symbol will flash at the right of the screen, you will need to follow it, it will take you directly to where the Butcher’s prey is laying and when it speaks to you, you will get the achievement.



The path that you need to follow will take you back to this area.



At the top there will be an opening that will lead you to where the prey is.





Find the empty grave

In the area where you need the plant to cross the river and grab the flute.





Cross the river and go all the way up until you come across a wall, to your right you will see an opening.



Go through it to find the empty grave. Interact with it to get the achievement.





Awaken the stuffed animals

In the area where you find the flute, there is a cabin to the north. Inside it you will find a beast npc and a bunch of characters that we cannot interact with.



Enter the cabin having the flute equipped, drop it and grab it again so that it makes sound.



All the stuffed animals’ eyes will start glowing red and you will receive the achievement.







Dig up the forgotten Alien

For this achievement, you will need to access a room in this area.



To reach it you will need to have a bridge plant and the torch item. Position yourself to the left of the river holding the plant and drop it.



You will use the torch to burn the bushes on the other side of the river in order to pass through.



In the next area you will find the Alien, and talking to it you will get the achievement.




 
Find the White Rabbit

For this achievement you will need the remote-control ability. There will be an area up north with a green TV, use it there and your screen will change to an area with a house and a little rabbit npc.





Talk to the rabbit to get the achievement.





Get the hidden candle in the Forest

In this area there is an opening to a corridor that leads you to the mini game where you can get the candle.



The way to the corridor is to the left of the screen.






Go all the way to the left to enter the maze and look for the candle

Summon the TV entity

Inside this room of the Mansion, stand in the middle of the couch.





Wait a few seconds and the TV will glow and an animation of a spirit coming out of it will appear. After this the achievement should pop up.





Get lost in the Mansion

For this achievement you will need to get in this room and talk to the eyes npc in there.





To access to the room where the eyes are, you need to go through the corridors behind the cabinets in the room and go all up until you find the npc for this achievement.







Find the creature that can’t stand up

For this one, I recommend having the torch item from the Caves.



To reach the room where you will get the achievement, you will have to traverse 2 dark rooms before. The room is in the section of the Mansion that connects with the Caves.











To reach this room, the one before will be dark and have spikes. You will cross it following this path.





Find the missing Twin

In this room with the npc and the green TV, use the remote-control to change the screen. You will see that the npc changed positions.





Talk to the new twin and you will get the achievement.





Talk to the guy inside the mirror

In this room you will find this npc that when he talks to you, he will only say ‘…’.





Therefore, you will need the purple bridge to pass through the mirror and talk to his “reflection”.



He will say to you “Who is the real one?” and you will receive the achievement.





Get the hidden candle in the Mansion

For this candle, you will need to enter in the fireplace located in this room.





Go inside the fireplace to enter the corridor and find the maze with the candle.

 
Hand over the key to the Keeper

In the Ruins there is an npc with a keylock on top of it, asking you for a key. This key is given by another npc in this room.





You will have to carry the key across the chambers of the Ruins back to this creature and interact with him.



The moment he takes the key from you, an animation occurs, and you will get the achievement.





Meet the lone traveller at the bonfire

In this room with the green TV, you will need the plant that makes bridges, the magnet and the remote-control.





Remember that moving one item from one screen to another when using the remote-control ability you need to be holding the item. Therefore, you will need to grab one, use the remote, drop it and change back to the previous screen in the TV to carry the other one.



You will need to place the magnet on the right and go with the plant to the other side. Then drop it so that the magnet attracts it, and the trajectory makes it reach the mark that activates it generating the bridge across the river for you to cross it.



In the room across the river, you will find the lone traveller sitting by the bonfire and will get the achievement once you talk with him.







Offer your blood on the altar

In this room you will see that there is a path to a room going up, but it is blocked by spikes.





You will need to take the item that makes you smaller in order to go through the spikes and continue your way to the secret room.





Once inside the room you will see more spikes that surround an altar. Approach the spikes and you will see that even in small size they still harm you and a pond of blood will appear.
Doing that you will get this achievement.



Get the hidden candle in the Ruins

In this large are, going to the wall on the bottom of the room you will notice a little opening that leads you to the maze where you can get this secret candle.



The opening will be at the bottom centre of this area

 
Join the musicians’ group

For this achievement you will need the flute that is found in the Forest. You will need to take the flute all the way to the room where you can find the musicians.


When you enter the room carrying the flute a music will start playing, and you will get the achievement.





End the hunger of the Giant Head

The Giant Head is located in the following room. You will find that the room to the left has a bomb. What you will need in order to get this achievement is to feed an ignited bomb to the Head.



You will notice that when you interact with it the Head will take out it’s tongue and do a swipe with it.





Taking advantage of this, you will need to ignite the bomb, quickly talk to the Head and drop the bomb in front of it. It will eat the bomb and blow in pieces, giving you the achievement.





Find the quiet dog amidst the Fire

The dog is in this room.



To reach it you will need to solve an easy puzzle using the boxes in the previous room and the torch item.



You will need to place the boxes in the spaces where the weed and the oil are close to each other so that the fire does not spread to the oil, and you can go through once the fire is out.





Once in the room, you will need to interact with the dog to get the achievement.





Discover a new species



To enter the room where you will get this achievement, you will need to be carrying the shovel item to the room before it. You can also take the torch item with you if you want to.



You will need to take the bomb from its box and use the shovel on the plant bridge. Take the plant all the way to the top right corner and drop it on the river, this will make a bridge appear across the river



After you manage to make a bridge that starts from the other coast of the river, you will need to light the bomb and place it in front of the stones to blow up an opening to the next area. Cross the bridge and get inside the next area. Here you will get the achievement




Water the Man-plant

This one is tricky because you will need to blow up a hole to get to a room with a watering can that you will need for this achievement. If you want, you can help yourself with the torch item because the previous room is all dark except for the enemies that leave trails of fire as they walk.



You need to take the bomb from the room with the little fire-man enemy and place it in the bottom of the path from the enemy in the middle of the room.





Where you see the torch is where the opening to the secret room is.



Once it blows up, you will see an opening that will let you enter the room and grab the watering can.



Take it all the way to the Man-plant and interact with him, you will see water coming out of it and he will turn into a Man-rose. Take the water can all the way to the the right until you reach the area with the Plant-man.







Rescue the Sunflower from its captor

For this one you will need to use the sword to kill the npc that looks like a big blue balloon fish.





Once you kill it, the blue flower in the room will change to a sunflower.



You will need to follow the sunflower all the way up until it enters a secret room full of other sunflowers.



After it stands still in the middle, you will receive the achievement.





Get the hidden candle in the Cave

In the room with the blue door, behind it, you will see some blood near the top wall.



Going through that spot you will enter the corridor that takes you to the secret maze where the candle is.



Enter through the wall that has a blood spot in front of it.

Catch the child on a tricycle

You will find the child in this room.



Once in the room, to get the achievement you just need to stand in his way. When he touches you, the achievement should pop up.





Make one creature defeat another

For this achievement you should make one of the blue Pacman-like enemies eat one of the white ghosts. The easiest way to do this is in this large room. Once you successfully make the Pacman eat a ghost the achievement will appear. This large room is the place where you will need to accomplish the task.



That is the only place where you will encounter both enemies in the Maze area.



Find the friendly beast

The beast is in the room locked by a magic door.



To open the door, you will need to solve the 3 blue buttons puzzle in the previous room. For that, you will need the magnet to move a metal box, the purple bridge to reach the button in the middle of the room and another item to activate the remaining button (I use the shrinking item because you can grab it in the Maze). Use the magnet to move the metal box to one of the buttons in the corners of the room.



Leave the room while holding the magnet and drop it on the other room. Take the other item and place it in the opposing corner. And finally use the bridge to climb through the wall and activate the button in the centre of the room.



Then go to the unlocked room and talk to the beast to get the achievement.





Make your way to the centre of the labyrinth

To reach the labyrinth first you need to change the position of the plant bridge.



For this you will 2 items: the purple bridge and the shovel. Using the purple bridge to climb through the wall and take the plant bunny out.



Place it over the original position of the bridge and use the shovel to take both out and relocate the bridge.



Then use the purple bridge to climb up the wall and enter the next room.



Inside the room you will find an npc, talk to it and proceed to the next room.



You will find yourself in a dark room and a red string will follow you marking the path you take.
To reach the centre where the Minotaur is waiting follow this path.

1


2


3


4


5


6


Once you talk to the Minotaur you will get the achievement.





Get the hidden candle in the Maze

The way to the corridor of the candle maze, can be found in this room.



Enter the corridor from the top of the room

Spelling Bee
Spell all the words correctly

For the spelling bee achievement, you will need to spell correctly all the words that the machine will say. After it repeats at least of the words it has already said you will get the achievement instantly. The words you need to spell properly are:
Ambition, Between, Children, Demon, Mortality, Prison, Time, Transcendence.



Bullseye
Play darts and hit the centre

This one is simple. Grab the darts from the box to your left and aim to the target that is in the wall, to the left of the window. You will need to hit the centre to unlock the achievement.



Say Cheese
Pose for the photo

For this one you just need to go to the area where the photographer is, at the entrance to the Village.



Stand on the grey square that is in front of the photographer, to the left of the screen and wait for the picture. A flash will appear, and you will hear the camera shutter. Leave the screen and turn to the right, over the desk you will see and instant camera with a picture underneath it.



Take it and you will receive the achievement.

Defeat the Beast in the Forest

To win against the Beast, you will need to use the shovel to clear the exploding plants and replace them with the thorns. You will need to make the Beast hit the thorns in order to damage it. After 3 hits, the Beast will die, and you will get the achievement after getting the artifact.



Defeat the Artist in the Mansion

This is the only fight where you do not need an in-game item to beat the boss. You will need to avoid the attacks it throws at you and when it stops in front of the canvas to draw the little creatures that follow you around, use the remote-control to change the screen and turn the canvas into a mirror. This will damage the boss, after 3 hits you will defeat it and will be able to get the artifact, and thus the achievement.



Defeat the Master Head in the Ruins

To beat the Master Head, you will need to use the magnet to make the spikes move and hit the Head. When it hides, you will need to hit one of its hands. The way to this is by baiting it when one is about to pound you from above and let it hit a spike placed near you. To defeat it you will need to hit the head 3 times. After the third hit, you will need to hit the left eye of the Head that appears outside the window of the room. Hit it with the darts 3 times and it will disappear. On the TV screen you will see that the artifact appeared where the Head was and you will be able to grab it, finishing the boss fight.



Defeat the Pianist in the Caves

The Pianist fight is a little bit difficult because it takes place in a dark room full of oil puddles. To defeat the boss, you need to hit him with bomb explosions. After defeating it you will be able to grab the artifact and get this achievement.

Reach “The Bad” ending

The bad ending is the one you get when entering the lair of the final boss without the sword.



This way, the egg in the room will explode and a blinding light will turn the screen white.



After it disappears, you will find yourself on a corridor leading to a digital replica of the room outside the game.





You will get the achievement after looking around the room and focusing on the TV.





Reach “The Good” ending

For the good ending, you will need to enter the lair having the sword.



With it you will need to pop up the egg in the room, this will trigger the final boss.



It has 2 phases; the first one is a regular battle where you will need to evade its attacks and strike with the sword when the orbs are not around the boss. If not, you will receive damaged and will not damage the boss.



After 4 hits it will take the sword from you and the fight will change to the second phase.





To defeat it you will need to get a bomb inside the walls that separates you from the boss, the fight is basically a big puzzle where you need one item to unlock the next and so on.





After hitting the boss with the bomb, the sword will appear again, and you will be able to give the final blow.





But that is not all, after this you will be thrown out of the TV and the sword will appear in front of you, use it to destroy the Limbo 2800 and finally defeat the Evil Wizard.





Then you will stand up and be able to leave the room towards a light outside. This will give you the Good Ending.





Reach "The Secret" ending

You can get this ending by doing the same process to achieve the Good Ending but changing your final decision after the boss fight. Once you destroy the Limbo 2800, instead of going to the door, turn around and open the closet door to find a box with a copy of Tormenture.



Grab the game copy and after a few seconds the screen will start to brake, the Evil Wizard will appear on the right and a laugh will sound on the distance. After all this you will get the achievement for the secret ending.

Hope this guide was useful for any of you guys that enjoyed the game and wanted to complete it to a 100 %.

I invite you to write down in the comments any suggestion or criticism that you think will improve this guide.

Thank you very much.

Have a good one!!