Here is the full list of all 12 Cubotrox achievements.
Complete 100 levels
Score points 100 times with the maximum multiplier
Earn 100 cubotroxes
Score points 10 times consecutively with the maximum multiplier
Place 4 correct cubes in 2 seconds
Complete 50 levels
Earn 50 cubotroxes
Complete 20 levels
Place 30 correct cubes consecutively
Place 10 correct cubes consecutively
Place 20 correct cubes consecutively
Earn 20 cubotroxes