ME3: Modify a weapon.

ME3: Chase down an assassin.

ME3: Return to active duty.

ME2: Acquire all trophies

ME2: Survive suicide mission

Establish or rekindle a romantic relationship in two games in Mass Effect Legendary Edition

ME2: Obtain geth technology

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

ME2: Gain the loyalty of the Cerberus Operative

ME2: Gain the loyalty of the Assassin

ME2: Thresher Maw defeated

ME2: Confront the Shadow Broker

ME2: Gain the loyalty of the biotic Convict