Here is the full list of all 22 Ever Seen A Cat? 3 achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Find 1000 cats from any place.
Got all the achievements!
Find all the individually unique cats in this place at least one time.
Cleared Cinderella for the first time.
Cleared the Gingerbread Man for the first time.
Find 500 cats from any place.
Cleared Jack and the Beanstalk for the first time.
Cleared the Little Mermaid for the first time.
Cleared Rapunzel for the first time.
Cleared Little Red Riding Hood for the first time.
Cleared the Frog Prince for the first time.
Cleared Hansel and Gretel for the first time.
Find 100 cats from any place.
Cleared Goldilocks for the first time.