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