Here is the full list of all 12 Smiling Girls achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Gaia Hight
Agnia Hight
Genevieve Hight
Gaia Normal
Agnia Normal
Genevieve Normal
Hera Easy
Gaia Easy
Agnia Easy
Genevieve Easy
GameOut
GameOn