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