Successfully pass close to a guard in a distrust area by blending with a group of monks

Release a firefly in your settlement

Complete the Asgard and Jotunheim quests

While on fire during a fight, kill 3 hard difficulty soldiers without breaking their shields

Complete the Suthsexe Arc

Swim a total of 3km with the horse

Complete the Cent Arc

Ram and destroy 5 boats in under 2 minutes with your longship (Base game only)

Complete 3 Cairn challenges

Destroy 10 Curse Symbols (Base game only)

Complete the East Anglia Arc

Create a Jomsviking

Complete the Grantebridgescire Arc