Make the final assault.

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

Finish all multiplayer maps or all N7 missions in single-player.

Extract ancient technology.

Call down an orbital strike.

Disable a group of fighter squadrons.

Discover an enemy's monstrous origin.

Establish or rekindle a romantic relationship.

Kill 100 enemies with melee attacks.

Hijack an Atlas mech.

Lift 100 enemies off the ground with powers.

Stop a Cerberus kidnapping.

Use bees to harass an enemy