Here is the full list of all 20 Hentai NetPuzzle achievements.
Finish Level 1
Finish Level 2
Finish Level 3
Finish Level 4
Finish Level 5
Finish Level 6
Finish Level 7
Finish Level 8
Finish Level 9
Finish Level 10
Finish Endless Mode Level 1
Finish Endless Mode Level 2
Finish Endless Mode Level 5
Finish Endless Mode Level 20
Finish Endless Mode Level 50
Finish Endless Mode Level 100
Finish Endless Mode Level 200
Finish Endless Mode Level 500
Finish Endless Mode Level 1000