Here is the full list of all 21 Let the Cat in achievements.
Passed 40 locations with 3 stars!
Completed 50 locations!
Collected 100 stars!
Played 50 games!
Gained 100000 points!
Completed 10 locations with one object!
Collected 40 stars!
Completed 20 locations!
Collected 250 stars!
Played 150 games!
Played 250 games!
Completed 30 locations with one object!
Completed 50 locations with one object!
Completed 100 locations!
Passed 80 locations with 3 stars!
Passed 150 locations with 3 stars!
Gained 250000 points!
Gained 500000 points!
Used 25 hints!
Used 50 hints!
Used 75 hints!