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.
Fill all 9 Pits in Chapter7
Chapter14 Clear
Chapter13 Clear
Hidden stage clear
Chapter12 Clear
Collect 5 Rune Stones
Chapter11 Clear
Chapter10 Clear
Release earth energy 10 times
Chapter9 Clear
Release fire energy 10 times
Chapter8 Clear
Release wind energy 10 times
Chapter7 Clear
Chapter6 Clear
Chapter5 Clear
Cast 30 spells
Chapter4 Clear
Chapter3 Clear
Chapter2 Clear
Chapter1 Clear
Release water energy 10 times