Burke agreed to help you kill Marcano

Completely weakened a racket by killing all of its Enforcers

Cassandra agreed to help you kill Marcano

Pull 20 enemies over when hanging from a ledge

Play in the ocean near the sunken ship

Perform 10 combo buddy takedowns

Find a Journal Entry

Stealth take-down 5 enemies

In Campaign, kill an enemy through a wall or obstruction.

Have Moira stun an enemy and Claire follow up with a physical attack in the main campaign.

Purchase all skills in one category.

Kill 40 enemies with the shotgun.

Loot 200 enemies.