Here is the full list of all 17 Backrooms Break achievements.
..or is it?
Found the elevator
Hopefully it's almond water
Acquired first gun
Found the gun cabinet key
Get a first kill
Died for the first time
How do I get out of this place?
Found first weapon attachment
Escorted the ball into the elevator
Acquired the assault rifle
Acquired the shotgun
Acquired the sniper rifle
Theseus would be proud
We need to go deeper
Kill the invisible monster
Break all the walls in Level 0