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