Collect 75 Logs

Complete Chapter 4 on any difficulty setting

Kill a Brute

Dismember 25 Necromorph Limbs (single player only)

Complete Chapter 3 on any difficulty setting

Kill 30 enemies with the Plasma Cutter

Dismember 20 Limbs

Kill 5 enemies in a row using 5 different weapons or attachments in Single Player or Special Ops.

Complete any research project in the Normandy's laboratory

Make 20 enemies scream as they fall or are set on fire

Kill 2 enemy helicopters without getting hit in a Special Ops Survival game.

Unlock 15 new Mass Effect 2 codex entries