ME3: Defeat an old adversary.

ME3: Extract ancient technology.

ME3: Stop an out-of-control scheme before it's too late.

ME3: Uncover an ancient secret.

ME3: Call down an orbital strike.

ME3: Sabotage a dreadnought.

ME3: Evacuate a scientific facility.

ME3: Explore a lost city.

ME3: Defeat a harvester.

ME3: Destroy an Atlas dropped from orbit.

ME3: Bring a veteran officer aboard.

ME3: Dispatch 10 probes to retrieve people or resources in Reaper territory.

ME3: Visit a store on the Citadel.