Here is the full list of all 12 Infommi achievements.
The base game contains 11 achievements, and there is 1 DLC pack containing 1 achievements.
Unlock Steve.
Unlock BorderLiner.
Unlock IzerFeuer.
Unlock Valkina.
Acquire a total of 1000 teeth.
Defeat Libura.
Defeat any boss.
Defeat Libura on Insanity.
Defeat Libura on Insanity without taking any damage.
Defeat the room.
Defeat the room on Insanity.
Launch the game.