Answer a ringing phone

Drop in on an old friend

There is only one way in

Save the damsel, but is she in distress?

Successfully counter all of a Brute’s damage-giving attacks

Defeat five enemies in a row using stealth attacks

Make five enemies drop their grenade by shooting them

Defeat 20 enemies with hand-to-hand combat

Acquire 20000 experience points

Kill the Crow Witch

Get the Dark Gauntlet

Acquire 1000 experience points

Dismember 2,500 Necromorph Limbs (single player only)