Here is the full list of all 13 Doorways: Prelude achievements. It takes around 2-3 hours to unlock all of the achievements on Windows.
Collect your first Relic
Finish the Tutorial
Pickup all notes
Pickup all notes from The Forest of Stakes
Pickup all notes from The Auditorium
Collect all Relics
Collect all Relics of Marble from The Cave
Collect all Relics of Metal from The Forest of Stakes
Collect all relics of Bronze from The Auditorium
Find all Torture sketches
Find all Museum paints
Finish Chapter 1
Finish Chapter 2