Here is the full list of all 13 Catie in MeowmeowLand achievements.
Activated all sphinxes in the credits
Found all 6 hidden gems
Found all the eyes
Lit up 20 matches
Finished the game in 90 minutes
Solved the terracotta cats puzzle in under 30 seconds
Finished the game
Collected all the stars
Poked Catie 100 times
Fixed the radio
Heard 100 meows
Got rid of the snake peacefully
Completed the tutorial