ME2: Fully upgrade a weapon

ME2: Disrupt the shields of 25 enemies

ME2: Successfully recruit the krogan

ME2: Defend a human colony from attack

ME2: Evolve any power

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

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: Perform 30 headshot kills with any weapon on humanoid targets

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

ME1: Acquire all trophies