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