Here is the full list of all 27 GlassBox achievements.
Finish 10 level
Finish 20 level
Finish 30 levels
Finish 40 levels
Finish 50 levels
Finish 60 levels
Finish 70 levels
Finish 80 levels
Finish 90 levels
Get 1 Gold medals
Get 10 Gold medals
Get 20 Gold medals
Get 30 Gold medals
Get 40 Gold medals
Get 50 Gold medals
Get 60 Gold medals
Get 70 Gold medals
Get 80 Gold medals
Get 90 Gold medals
Collect 5 Balls
Collect 10 Balls
Collect 20 Balls
Collect 30 Balls
Collect 40 Balls