Here is the full list of all 15 Ramify achievements.
Finish level 123
Finish level 120
Finish level 110
Finish level 100
Finish level 90
Finish level 80
Finish level 70
Finish level 60
Finish level 50
Finish level 40
Finish level 30
Finish level 20
Finish level 10
Finish level 1
Click on the credits