Opened all presents in Winter Wonder.

Changed into the Festive Fellow Outfit.

Return the Hammer of the Rebellion

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

Collect all of the Artifacts

Craft the Dragon Scaled Armor Set

Complete all of the Crater Hunts

Collect one flower from each of the nine realms

Battle the All-Father

Obtain all Shields

Battle Garm

Upgrade one piece of armor

Equip an Enchantment