Here is the full list of all 24 Cats in Time achievements. It takes around 4-5 hours to unlock all of the achievements on Windows.
Visit every Greek location.
Everyone needs some help.
Visit every ancient Egypt location.
Catch some fish.
Solve level without any hints.
Wow, that was quick!
Collect all cats on one level.
Do nothing and enjoy the moment.
Destroy everything!
I knew it!
Collect every cat in the game.
Korben, is that you?
Find the secret level.
Visit every wild west location.
Fly away!
Visit (almost) every location in the game.
Visit every Tokyo location.
Visit every German location.
Visit every New York location.
Found him!
Visit every period in the game.
Collect all postcards pieces in the game.
Forge the sword.
Visit every underwater location.