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