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.
Collect every cat in the game.
Visit (almost) every location in the game.
Visit every period in the game.
Collect all postcards pieces in the game.
Visit every underwater location.
Find the secret level.
Visit every Tokyo location.
Korben, is that you?
Fly away!
Visit every New York location.
Found him!
Visit every wild west location.
Forge the sword.
Visit every German location.
Everyone needs some help.
Visit every Greek location.
Visit every ancient Egypt location.
Catch some fish.
Do nothing and enjoy the moment.
Solve level without any hints.
Wow, that was quick!
Collect all cats on one level.
Destroy everything!
I knew it!