Here is the full list of all 32 Nyasha achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Hikeru Hight
Michie Hight
Tomiko Hight
Shinju Hight
Keoru Hight
Yoko Hight
Shinju Normal
Hikeru Normal
Nori Normal
Michie Normal
Megumi Normal
Keoru Normal
Yoko Normal
Aki Normal
Shinju Easy
Tomiko Easy
Tomiko Normal
Arizu Normal
Nori Easy
Michie Easy
Megumi Easy
Aki Easy
GameOut
Arizu Hight
Nori Hight
Megumi Hight
Aki Hight
Hikeru Easy
Keoru Easy
Yoko Easy
Arizu Easy
GameOn