Here is the full list of all 19 Last Floor achievements.
Received the key to the abandoned room.
You found Secret with a first aid kit in stairs.
Axe for chopping wood found.
Completed all 3 tests: Denial, Anger, Acceptance.
Received the key to the music lover room.
Get to the 9th floor. All still to future.
Mop found.
Received the key to the stairs from Mikhalych.
First acquaintance with a teapot.
Long look at the Anfisa doll.
Make a fall from home.
You found Secret with a first aid kit in apartment.
You found Secret with a batteries in stairs.
You found Secret with a first aid kit in bedroom.
Get to the 4th floor. Most of path has been completed.
Strong vaccum cleaner has ben killed.
Alien ship captain was killed.
Destroy flying alien ship.
Be kidnapped by an alien force.