Otherwordly Portal Achievement
Otherwordly PortalChapter 6
Towards the end of the chapter, after you've opened all four constellation doors and gotten all 5 symbols marked on your hand, you'll now have access to all 5 symbol buttons on the four disks in the center of the big chamber. To unlock this achievement, starting with all disks inactive and with your back to the stairs that lead into this chamber, on the front left disk press the leftmost button; on the front right disk press the top middle button. This should cause you to look up into the sky and see a scene, unlocking this achievement.