Here is the full list of all 11 Cross Pixels achievements.
Complete everything! Now go on and solve some more Workshop Levels
Now we are talking
Solve 250 Levels
Come on give me more...
10x10 what a joke! You need bigger challenges
Complete 150 Levels
Tiny Levels are no longer a challenge for you
Solve 50 Levels
Complete 10 Levels
Solve your first Level
The tools are yours, now go and use them.