Here is the full list of all 22 Seek Girl Ⅷ achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Release earth energy 10 times
Chapter14 Clear
Chapter13 Clear
Hidden stage clear
Collect 5 Rune Stones
Release fire energy 10 times
Release wind energy 10 times
Cast 30 spells
Release water energy 10 times
Fill all 9 Pits in Chapter7
Chapter12 Clear
Chapter11 Clear
Chapter10 Clear
Chapter9 Clear
Chapter8 Clear
Chapter7 Clear
Chapter6 Clear
Chapter5 Clear
Chapter4 Clear
Chapter3 Clear
Chapter2 Clear
Chapter1 Clear