Here is the full list of all 20 IMMURE achievements.
The base game contains 11 achievements, and there is 1 DLC pack containing 9 achievements.
Achieved invincibility.
Unlocked the secret door in the Mansion.
Unlocked the Crowman & Wolfboy Masks.
Unlocked the Safe Room Guy's mask.
Unlocked the Sally Face mask.
Completed the first Nightmare.
Found every vision within the Apartments.
Chose to save Brennen.
Chose to destroy the fireman.
First death.
Performed a bullet counter.