Here is the full list of all 32 Nya Nya Nya Girls 2 achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
GameOut
Amaya Asuka Hight
Naomi Hight
Koheku Hight
Sakura Hight
Manami Rica Hight
Miyuki Hight
Ayam Hight
Kazumi Hight
Seyeri Takara Hight
Amy Hight
Amaya Asuka Normal
Naomi Normal
Koheku Normal
Sakura Normal
Manami Rica Normal
Miyuki Normal
Ayam Normal
Kazumi Normal
Seyeri Takara Normal
Amy Normal
Amaya Asuka Easy
Koheku Easy
Sakura Easy
Manami Rica Easy
Miyuki Easy
Ayam Easy
Kazumi Easy
Naomi Easy
Seyeri Takara Easy
Amy Easy
GameOn