These achievements are automatically granted once you reach the very first room of the related floor. You will automatically receive them, just by playing casually through the game.

Humble Beginnings
Reach the Excavation (Floor 1).


Archive Diving
Reach the Archives (Floor 2).


Underflow
Reach the Maintenance System (Floor 3).


Molten Core
Reach the Bellows (Floor 4).


End Layer
Reach the Sanctum (Floor 5).



The 6th floor is the only floor you can not automatically reach. You will have to find 4 so-called "Seals" first to open the door, that is waiting for you after the fight with the Overlord.

Forbidden
Reach the nameless 6th Floor.


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These achievements are granted once you get an S Ranking in the corresponding section.
Just defeat the Overlord and then leave through a side door, instead of continuing by entering the unsealed door. Otherwise your Ranks will keep on "generating" until you finish the 6th floor...
or die.

Master of the Unseen
Get an S Rank in Secrets (Find all secrets).


Thorough Explorer
Get an S Rank in Exploration (Visit all rooms).


Speed Runner
Get an S Rank in Time (Under 20 minutes).


Evasive
Get an S Rank in Damage (10 hits or fewer).


Exalted
Get all 4 S Ranks in one run.


TIP: Use the Intense Lethality mode for a 4 S-Ranking run, as the bonus dmg will help greatly, killing off enemys much faster and thus saving precious time. You can also use a seeded run to find the scripted secret rooms faster and, as a result, saving valuable bombs. You might need them for the Overlord fight, do not forget: Intense Lethality gives you a maximum of 5 HP.

These achievements are obtainable by playing through the different difficulty modes, which you can choose at the arcade machine in the starting room. Simply choose a spaceship and press RMB to activate it. To finish a difficulty mode you need to defeat the boss of the 6th floor. Hard mode will be automatically unlocked after beating the boss on floor 6 for the first time, while both Sword and Chaos Mode require you to purchase the corresponding ships at Kleines, both costing 200,000G.

Accursed One
Cleared Normal Mode.


Ego Sum Aeternae
Cleared Normal Mode by completing the 6th floor.


Freedom
Cleared Hard Mode.


Blessed One
Cleared Sword Mode.


Anarchist
Cleared Chaos Mode.


TIP: Seeded runs can help you here as well. Try out different seeds to find the optimal one with the best weapons, upgrades and DMG/Ammo-Boosts!

Annoying
Talk with the cat and pick the category "Gossip" until he has enough !


Too Refined
Sometimes, little ghost enemies will wear different kinds of hats. By killing them you automatically add their hats to your collection. You can use these to customize your ghost pet (wich you will receive from the cat after finishing a few runs).

Tag Champion
Once in a while you will find friendly NPCs waiting for you in the Starting Room. One of them is the "Hermit". If you talk to him he will run away. Catch him in quick succesion (you will hear a blinking sound) by drifting and tagging him as fast as possible until he explodes.

Those You Could Save
Another friendly NPC is the Blast Core. There is a small chance of a bow usually spawning in the secret room on the 6th floor . Pick it up and next time you see Blast Core in the Starting Room, talk to him to give him the bow.

You can also find the bow in the secret room of the 5th floor in seed 38474392 (thanks to username Fexus).

These achievements have something to do with a characteristic or specialty of a run.

Intense
Won the game on Intense Lethality by beating Overlord. Choosable at the arcade machine in the Starting Room.

Death, Suddenly
Won the game on Sudden Death Lethality by beating Overlord. Choosable at the arcade machine in the Starting Room.

Peashooter
Won by beating the boss on the 6th floor without getting any weapons. Seeds can help you, as well as the standard weapon modifying upgrade.

Power Internal
Won by beating the boss on the 6th floor without getting any upgrades. Seeds can help you.


Treasure Trove
Finished a run with a score of 100,000. Play on normal mode, which has a maximum multiplier of 2.5x. Get a higher score by stacking your multiplier (do not get hit) and salvaging vault keys (take the key to the next floor).

Impossible Riches
Finished a run with a score of 200,000. Play on normal mode, which has a maximum multiplier of 2.5x. Get a higher score by stacking your multiplier (do not get hit) and salvaging vault keys (take the key to the next floor). A floor 5 or 6 vault key is almost mandatory for you to reach 200000, unless you can pull off floor 5 and 6 bosses flawlessly.

Seed 38831040 is a great seed for this achievement, as it usually has a high number of keys in it (generally 5 or 6). However, note that the number of keys seems to be random within a seed, so it may not work every time.

Thank you for reading. You can help us keeping this guide updated! Let us know about helpful tricks or possible bugs with certain achievements. Correct us, if we wrote something down wrong or incomplete.
Oh also: feel free to rate!