Here is the full list of all 21 BITROOM achievements.
Turn off all sounds in settings.
Get your first weapon.
Get your first real weapon.
Get more powerful weapon.
Find something better than apples.
Kick the enemy with your foot.
Finish off an enemy with your foot.
Defeat the first enemy.
Kill ten zombies.
Kill twenty five zombies.
First death.
Read all notes.
Talk to a strange man in a white coat.
Talk to the fisherman.
Talk to granny.
Start the latest build of Max's game.
Lose control.
Get possible allies.
Creating an error in the simulation.
Finish Max's story in the simulation.
Inspect everything in a school classroom.