Completed The Gardens.

Win Every Trophy

Catch a fish of each type using the fishing line

Complete all Roman collector challenges

Complete all territories

Perform a 150m slide in the snow

Obtain all video fragments and watch the hidden truth video

Obtain Thor's Helmet

Spend your first Mastery point

Complete "The Prophecy" storyline

Assassinate an enemy from your horse

Collect 5 Treasure Hoard rewards (Base game only)

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