ME3: Disable a group of fighter squadrons.

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

ME3: Discover an enemy's monstrous origin.

ME3: Perform any combination of 50 biotic combos or tech bursts.

ME3: Explore a lost city.

ME3: Lift 100 enemies off the ground with powers.

ME3: Destroy an Atlas dropped from orbit.

ME3: Hijack an Atlas mech.

ME3: Bring a veteran officer aboard.

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

ME3: Set 100 enemies on fire with powers.

ME3: Visit a store on the Citadel.