Here is the full list of all 25 3D Hentai Blackjack achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Claire 5 stage
Claire 4 stage
Claire 3 stage
Claire 2 stage
Maya 5 stage
Maya 4 stage
Maya 3 stage
Maya 2 stage
Alisa 5 stage
Alisa 4 stage
Alisa 3 stage
Alisa 2 stage
Emilie 5 stage
Emilie 4 stage
Emilie 3 stage
Rose 5 stage
Rose 4 stage
Rose 3 stage
Rose 2 stage
Emilie 2 stage
Emilie 1 stage
Alisa 1 stage
Rose 1 stage
Maya 1 stage
Claire 1 stage