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
Solved the terracotta cats puzzle in under 30 seconds
Got rid of the snake peacefully
Lit up 20 matches
Finished the game
Collected all the stars
Fixed the radio
Poked Catie 100 times
Heard 100 meows
Completed the tutorial
Finished the game in 90 minutes