Here is the full list of all 13 Marble Skies achievements.
Bounce your marble really high!
Complete every state in Beginner, Intermediate, and Advance
Complete all Advanced stages
Complete all Advance stages
Complete all Beginner stages
Fall off the map 1000 times.
Fall off the map 100 times.
Play your first Advanced Level
Fall off any level for the first time.
Play your first Intermediate Level
Get a World Record time on any level.
Play your first Beginner Level
Roll your marble 100 Kilometers.