Here is the full list of all 21 Moonleap achievements.
The base game contains 19 achievements, and there is 1 DLC pack containing 2 achievements.
you died 10 times
you died 100 times
you completed world 1
you completed world 2
you completed world 3
you completed world 4
catching the crow on the first stage
you captured all the crows!
you completed the game
you completed the game 100%
you completed the secret 1
you completed the secret 2
you completed the secret 3
you completed the secret 4
you completed level 22
you completed all secret levels
you stopped moving for 30 seconds
you got stuck in the level 3
You got S rank in all levels
you completed the secret world
you unlocked Skid and Pump