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