ME2: Gain the loyalty of the Assassin

ME2: Successfully recruit the Justicar

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

Assisted in solving the riddles

ME2: Complete the investigation of a derelict alien vessel

ME2: Incinerate the armor of 25 enemies

ME2: Gain the loyalty of the Professor

ME2: Hit 20 different targets with multiple biotic powers to combine the effects

Kill 100 enemies with melee attacks in Mass Effect 1, 2 or 3

ME2: Gain the loyalty of the Cerberus Officer

ME2: Defend a human colony from attack

ME2: Gain the loyalty of the mercenary

ME2: Successfully shut down the rogue VI in Project Overlord