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
GameOn
Arizu Easy
Arizu Normal
Arizu Hight
Aki Easy
Aki Normal
Aki Hight
Yoko Easy
Yoko Normal
Yoko Hight
Keoru Easy
Keoru Normal
Keoru Hight
Megumi Easy
Megumi Normal
Megumi Hight
Michie Easy
Michie Normal
Michie Hight
Nori Easy
Nori Normal
Nori Hight
Tomiko Easy
Tomiko Normal
Tomiko Hight
Hikeru Easy
Hikeru Normal
Hikeru Hight
Shinju Easy
Shinju Normal
Shinju Hight