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