Here is the full list of all 11 Vole Complexity achievements.
Collect 10 stars.
Get all 10 stars from Level 1.
Finish Level 1.
Get your first star.
Finish the first floor.
Collect 20 stars.
Collect 30 stars.
Get all 10 stars from Level 2.
Get all 10 stars from Level 3.
Finish Level 2.
Finish Level 3.