this guide just for,
non hardcore & non masochist player

if you want get achievement but not want struggle on all mission

first complete game on easy (get Restoration achievement)
after that
play from selected scene and choose primordial flood (last mission) revenge & hell
and you will get steam achievement

easy, don't need to play from beginning
thanks, this simple and useless guide just for achievement collector but with lazy way
LIKE ME :v🤣