ME2: Obtain geth technology

ME2: Gain the loyalty of the Assassin

ME2: Help the Justicar resolve her mission

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

ME2: Thresher Maw defeated

ME2: Gain the loyalty of the Cerberus Officer

ME2: Successfully recruit the Justicar

ME2: Complete the investigation of a derelict alien vessel

ME2: Successfully recruit the quarian

ME2: Complete 5 missions discovered by scanning unexplored worlds

ME2: Evolve any power

ME2: Incinerate the armor of 25 enemies