Full list of all 23 A Building Full of Cats achievements. It takes around 0-1 hour to unlock all of the achievements in the base game on Windows.
The base game contains 21 achievements, and there are 2 DLC packs containing 2 achievements.
You Adopted a cat! You are amazing!
You Found Fofiño
Find Fofiño
A big tail, indeed...
I see you!
You can't hide!
Find all 15 cats on the roof
Find all 50 cats in the fifth floor
Find all hidden cats in the fifth floor
Find all hidden cats in the fourth floor
Find all 50 cats in the fourth floor
Find all 50 cats in the third floor
Find all hidden cats in the third floor
Find all 50 cats in the second floor
Find all hidden cats in the second floor
Find all 50 cats in the first floor
Find all hidden cats in the first floor
Find all cats in the bunker
Find all hidden cats in the bunker