ME2: Gain the loyalty of Archangel

ME2: Complete the investigation of a derelict alien vessel

ME2: Successfully recruit the Assassin

ME2: Successfully shut down the rogue VI in Project Overlord

ME2: Defend a human colony from attack

ME2: Successfully recruit the biotic Convict

ME2: Complete a mission discovered by scanning an unexplored world

ME2: Complete any research project in the Normandy's laboratory

ME2: Make 20 enemies scream as they fall or are set on fire

ME2: Unlock 15 new Mass Effect 2 codex entries

Kill 1,000 enemies in Mass Effect 1, 2 or 3

ME1: Complete the game on any difficulty

Establish a romantic relationship in Mass Effect 1, 2 or 3