Here is the full list of all 32 Nya Nya Nya Girls achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Mommo Normal
Acane Aoi Easy
Akemi Easy
Ameli Easy
Any Easy
Asami June Isenami Easy
Ayano Easy
Katsumi Easy
GameOut
Mizeki Hight
Kitty Easy
Kitty Hight
Katsumi Hight
Ayano Hight
Asami June Isenami Hight
Any Hight
Ameli Hight
Akemi Hight
Acane Aoi Hight
Mommo Hight
Acane Aoi Normal
Akemi Normal
Ameli Normal
Any Normal
Asami June Isenami Norma
Ayano Normal
Katsumi Normal
Kitty Normal
Mizeki Normal
Mizeki Easy
Mommo Easy
GameOn