ME3: Disable a group of fighter squadrons.

ME3: Defeat a group of Spectre-level opponents on Normal, Hardcore, or Insanity.

ME3: Discover an enemy's monstrous origin.

ME3: Sabotage a dreadnought.

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

ME3: Explore a lost city.

ME3: Uncover an ancient secret.

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

ME3: Destroy an Atlas dropped from orbit.

ME3: Modify a weapon.

ME3: Set 100 enemies on fire with powers.

ME3: Escape a Reaper in the galaxy map.

ME3: Bring a veteran officer aboard.