Here is the full list of all 20 Hentai NetWalk achievements.
Finish Level 4
Finish Level 3
Finish Level 2
Finish Level 1
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 10
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