Run through 30 breakable objects

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

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

Complete 10 World Events

Perform a 150m slide in the snow

Collect 5 Treasure Hoard rewards (Base game only)

Complete a Standing Stone puzzle

Complete Hamtunscire Arc

Complete the Asgard and Jotunheim quests

Complete the Suthsexe Arc

Collect all the Trophies

Complete 'Low Profile' without triggering any alarms.