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 200 puzzles.
Complete 175 puzzles.
Complete 150 puzzles.
Complete 125 puzzles.
Complete 100 puzzles.
Complete 75 puzzles.
Complete 50 puzzles.
Complete 25 puzzles.
Watch the credits without skipping.
Open at least 11 of the 17 different menus/submenus.
Complete all 25 by 25 abstract puzzles.
Complete all abstract puzzles.
Complete all 20 by 20 abstract puzzles.
Complete all 15 by 15 abstract puzzles.
Complete all 10 by 10 abstract puzzles.
Complete all 5 by 5 abstract puzzles.