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