ME3: Visit a store on the Citadel.

ME3: Modify a weapon.

ME2: Keep your team alive through the suicide mission

ME2: Save humanity throughout the galaxy from certain annihilation

ME2: Use the Omega 4 Relay

ME2: Obtain geth technology

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

ME2: Successfully shut down the rogue VI in Project Overlord

ME2: Gain the loyalty of the Assassin

ME2: Gain the loyalty of the biotic Convict

ME2: Gain the loyalty of the krogan

ME2: Gain the loyalty of the quarian