Collect 50% of the prize bubbles on the story levels

Place a sticker or a decoration on another player's sackperson

Collect 200 Light Seeds.

Throw 10 Soldiers of Ahriman into pits.

Collect 100 Light Seeds.

Use the Compass.

Completing the Canyon.

Unlock Elika's Saving Ability.

Enter the Canyon.

Complete Chapter 6 - 1 on any difficulty setting.

Build up a certain level of trust with your partner.

Complete Chapter 5 - 3 on any difficulty setting.