Here is the full list of all 100 Hentai Waifu achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Complete Level 9 Hard Mode
Complete All Level Hard Mode
Complete Level 8 Hard Mode
Complete Level 7 Hard Mode
Complete Level 6 Hard Mode
Complete Level 5 Hard Mode
Complete Level 4 Hard Mode
Complete Level 3 Hard Mode
Complete Level 2 Hard Mode
Complete Level 1 Hard Mode
Complete Level 9
COmplete Level 8
Complete Level 8
Complete Level 7
COmplete Level 7
Complete Level 6
COmplete Level 6
Complete Level 5
Complete Level 4
Complete Level 3
COmplete Level 3
Complete Level 2
COmplete Level 2
Complete Level 1
COmplete Level 1