Here is the full list of all 32 Elemental Girls achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Pelagia Hight
Pelagia Normal
Genevieve Normal
Selina Easy
Pelagia Easy
Serafina Hight
Lesma Hight
Selina Hight
Zinovy Hight
Korentine Hight
Hera Hight
Gaia Hight
Agnia Hight
Genevieve Hight
Selina Normal
Serafina Normal
Zinovy Normal
Lesma Normal
Korentine Normal
Hera Normal
Gaia Normal
Agnia Normal
Serafina Easy
Zinovy Easy
Lesma Easy
Korentine Easy
Hera Easy
Gaia Easy
Agnia Easy
Genevieve Easy
GameOut
GameOn