Here is the full list of all 16 Nonozle achievements.
The base game contains 10 achievements, and there is 1 DLC pack containing 6 achievements.
Complete all 5 by 5 abstract puzzles.
Complete all 10 by 10 abstract puzzles.
Complete all 15 by 15 abstract puzzles.
Complete all 20 by 20 abstract puzzles.
Complete all 25 by 25 abstract puzzles.
Complete all abstract puzzles.