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