Here is the full list of all 20 Paradox of the Cryptomancers achievements.
Solve one puzzle.
Solve two puzzles.
Solve three puzzles.
Solve four puzzles.
Solve five puzzles.
Solve six puzzles.
Solve seven puzzles.
Solve eight puzzles.
Solve nine puzzles.
Solve ten puzzles.
Solve eleven puzzles.
Solve twelve puzzles.
Solve thirteen puzzles.
Solve fourteen puzzles.
Solve fifteen puzzles.
Solve sixteen puzzles.
Solve seventeen puzzles.
Solve eighteen puzzles.
Solve nineteen puzzles.
Solve twenty puzzles.