Here is the full list of all 366 GooCubelets: OCD achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Beat Level 50
Beat Level 45
Beat Level 40
Beat Level 35
Beat Level 30
Finish level 1 more time
Beat Level 25
Beat Level 20
Beat Level 15
Beat Level 10
Beat Level 5
Beat Level 1