Here is the full list of all 100 Hentai Dates achievements.
Complete Aichi Noriko
Complete Takahata Chiyoko
Complete Angela Morikawa
Complete Ariyoshi Yurie
Complete Mizuki Rina
Complete Hanazono Yurika
Complete Eda Mika
Complete Yoshizawa Nanami
Complete Hamada Asami
Complete Meow Fuu
Complete Clitie
Complete Yuggnu Naruuy
Finish the game!