ME3: Mission accomplished.

ME3: Defeat an old adversary.

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

ME3: Uncover an ancient secret.

ME3: Obtain two non-customizable suits of armor.

ME3: Free Omega from Cerberus Occupation.

ME3: Call down an orbital strike.

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

ME3: Evacuate a scientific facility.

ME3: Hijack an Atlas mech.

ME3: Defeat a harvester.

ME3: Destroy an Atlas dropped from orbit.