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