Here is the full list of all 6 CatNab achievements.
Nabbed 500 cats!
You've got mail ... and a complete, utter disregard for the postal service.
The meteorologist forecasted a fantastic time to catch the northern flights.
Exceed maximum catpacity.
When I say stop, you say go.
Nab a multiplier cat, a chronos cat, and a bonus cat in that order.