Here is the full list of all 20 Hentai Sudoku achievements.
Hentai Sudoku Endless Level10
Pass Hentai Sudoku Endless Level9
Pass Hentai Sudoku Endless Level8
Pass Hentai Sudoku Endless Level7
Pass Hentai Sudoku Endless Level6
Pass Hentai Sudoku Endless Level5
Pass Hentai Sudoku Endless Level4
Pass Hentai Sudoku Endless Level3
Pass Hentai Sudoku Endless Level1
Pass Hentai Sudoku Endless Level2
Pass Hentai Sudoku Level10
Pass Hentai Sudoku Level8
Pass Hentai Sudoku Level9
Pass Hentai Sudoku Level7
Pass Hentai Sudoku Level6
Pass Hentai Sudoku Level4
Pass Hentai Sudoku Level5
Pass Hentai Sudoku Level3
Pass Hentai Sudoku Level2
Pass Hentai Sudoku Level1