Here is the full list of all 36 Hentai Jigsaw Puzzle achievements.
Complete level 12 in hard mode
Complete level 11 in hard mode
Complete level 10 in hard mode
Complete level 9 in hard mode
Complete level 8 in hard mode
Complete level 7 in hard mode
Complete level 6 in hard mode
Complete level 5 in hard mode
Complete level 4 in hard mode
Complete level 3 in hard mode
Complete level 2 in hard mode
Complete level 1 in hard mode
Complete level 12 in normal mode
Complete level 11 in normal mode
Complete level 10 in normal mode
Complete level 9 in normal mode
Complete level 8 in normal mode
Complete level 7 in normal mode
Complete level 6 in normal mode
Complete level 5 in normal mode
Complete level 4 in normal mode
Complete level 3 in normal mode
Complete level 2 in normal mode
Complete level 1 in normal mode
Complete level 12 in easy mode
Complete level 11 in easy mode
Complete level 10 in easy mode
Complete level 9 in easy mode
Complete level 8 in easy mode
Complete level 7 in easy mode
Complete level 6 in easy mode
Complete level 5 in easy mode
Complete level 4 in easy mode
Complete level 3 in easy mode
Complete level 2 in easy mode
Complete level 1 in easy mode