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.
Naomi Normal
Sakura Normal
Manami Rica Normal
Ayam Normal
Koheku Hight
Amaya Asuka Hight
Naomi Hight
Kazumi Hight
Sakura Hight
Manami Rica Hight
Miyuki Hight
Ayam Hight
Seyeri Takara Hight
Amy Hight
Amaya Asuka Normal
Koheku Normal
Miyuki Normal
Kazumi Normal
Seyeri Takara Normal
Amy Normal
Amaya Asuka Easy
Naomi Easy
Koheku Easy
Sakura Easy
Manami Rica Easy
Miyuki Easy
Ayam Easy
Kazumi Easy
GameOut
Seyeri Takara Easy
Amy Easy
GameOn