Here is the full list of all 12 fault milestone one achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Completed fault milestone one in both English and in Japanese.
Completed fault milestone one.
Competed - homeward bound.
Completed - measure of a girl.
Completed - born again shell.
Completed - beyond the line of magic and reason.
Completed - spearing the shadow.
Completed - discrepancies.
Completed - rude awakening.
Completed - galvanize!
Watched child Rune stab Marcos art in the gallery for over 2 consecutive hours in awe.
Replayed Selphine and Ritona’s change scene over 50 times.