Here is the full list of all 24 Chromadrome 2 achievements.
Complete all Arcade Levels
Complete Everything
Remove 36,000 Silvers
Remove 8,000 Golds
Complete Arcade Green Levels
Complete Arcade Bronze Levels
Complete Arcade Silver Levels
Complete Arcade Gold Levels
Complete Warp at Green Level
Complete Warp at Bronze Level
Complete Warp at Silver Level
Complete Warp at Gold Level
Obtain Green Degree
Obtain Bronze Degree
Obtain Silver Degree
Obtain Gold Degree
Complete Time Trial Green
Complete Time Trial Bronze
Complete Time Trial Silver
Complete Time Trial Gold
Complete Cromacing Green
Complete Cromacing Bronze
Complete Cromacing Silver
Complete Cromacing Gold