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