Pet Buckley the dog

Open all safes

While in stealth, turn off the spotlight generator in Pittsburgh

Pick up Frank's note after it's discarded

Find a Firefly pendant

Defeated a Glinthawk Flight

Completed a Legendary Climb

Climbed Brightdawn to the view of Dawn's Grasp

Shot a Warning Beacon

Kill 50 opponents using the environment (e.g. swamp gas, insects or objects).

Defeat Olaf, the Skellige champion of unarmed combat.

Collect all available Ofieri armor and horse gear, and at least one Ofieri sword.

Defeat all the fallen knights and loot their campsites.