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

Explore a lost city.

Escape a Reaper in the galaxy map.

Complete one multiplayer match or two N7 missions.

Defeat a Harvester.

Stop a Cerberus kidnapping.

Bring a veteran officer aboard.

Evolve any of your powers to rank 6.

Modify a weapon.

Chase down an assassin.

Start a character in multiplayer or customize a character in single-player.

Complete Mass Effect 2 twice, or complete it once with a character imported from Mass Effect 1

Hit 20 different targets with multiple biotic powers to combine the effects