Here is the full list of all 19 Last Floor achievements.
Be kidnapped by an alien force.
Long look at the Anfisa doll.
You found Secret with a first aid kit in apartment.
Destroy flying alien ship.
You found Secret with a first aid kit in bedroom.
Make a fall from home.
Strong vaccum cleaner has ben killed.
Get to the 4th floor. Most of path has been completed.
Alien ship captain was killed.
You found Secret with a batteries in stairs.
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.