No missable achievements (plus 12 unknown)
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Finish Act 1: The School
Find All Constellations Notes
Find your First Relic
Finish Act 2: The Mansion
Open the Gate to The Temple
Finish Act 3: The Temple
Finish The Doorways Saga
Find All Notes from Juan Torres
Find All Notes from Celia Torres
Find All Notes from Thomas Foster
Find All the Notes in the Game
Find All the Relics