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.
Selina Hight
Serafina Hight
Zinovy Hight
Lesma Hight
Pelagia Hight
Korentine Hight
Hera Hight
Gaia Hight
Agnia Hight
Genevieve Hight
Selina Normal
Serafina Normal
Zinovy Normal
Lesma Normal
Pelagia Normal
Korentine Normal
Hera Normal
Gaia Normal
Agnia Normal
Genevieve Normal
Selina Easy
Serafina Easy
Zinovy Easy
Lesma Easy
Pelagia Easy
Korentine Easy
GameOut
Hera Easy
Gaia Easy
Agnia Easy
Genevieve Easy
GameOn