Get the camera

Get tricked twice in a certain level

Put down both playing cards

Ride the train

Put the three paintings where they belong

Return to the hub world

Drop a battery onto your head

Break the only teleporter

Rewind for a really long time

Earned at least a Quarter Stripe mark in all three trials at one Hunting Ground.

Arrived at the Daunt seeking passage into the Forbidden West.

Achieve all possible trophies.

Defeat the Prime Evil.