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