Complete the Suthsexe Arc

Catch a fish of each type using the fishing line

Obtain all video fragments and watch the hidden truth video

Beat all the Orlog players

Complete all the flytings

Light the unlit braziers on Hadrian's Wall

Spend your first Mastery point

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

Complete the Lunden Arc

Complete 3 Cairn challenges

Obtain Thor's Helmet

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

Assassinate 10 enemies in a row without triggering a conflict