Promote a multiplayer character to the Galaxy at War or import an ME3 character.

Attain the highest level of readiness in each theater of war.

Complete Mass Effect 3 twice, or once with a Mass Effect 2 import.

Make the final assault.

Deliver most of the Galaxy at War assets to the final conflict.

Extract ancient technology.

Kill 10 guardians with headshots from the front while their shields are raised.

Sabotage a dreadnought.

Discover an enemy's monstrous origin.

Win a political stand-off.

Kill a brute while it's charging you.

Defeat a Harvester.

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