Return the Stags of the Four Seasons

Obtain all of the Apples of Iðunn and Horns of Blood Mead

Collect one flower from each of the nine realms

Collect all of the Books

Complete the Trials of Muspelheim

Complete a request for the Merchant.

Parry an enemy with a knife.

Collect all Trophies

Using only your Web Wings, glide from the Financial District to Astoria (Wind Tunnels are okay!)

Perform 30 Air Tricks in a row without touching the ground

Complete all EMF Experiments

Finish the main story