Finish the game on Medium.

Finish the game on Hard.

Finish the game on Nightmare.

Finish the game on "No One Can Hear Them Scream" mode.

During a campaign, kill 100 Xenomorphs.

Advance a Sergeant to level 10.

Advance a Gunner to level 10.

Advance a Medic to level 10.

Advance a Tecker to level 10.

Advance a Recon to level 10.

During a campaign, advance each Marine Class to level 10.

Keep all of your marines alive during a campaign.

Gather all datapads.

Kill an enemy by using an explosive barrel.

Secure an unconscious marine.

Destroy 4 eggs with one grenade or an RPG shot.

Have one Sentry kill at least 10 aliens.

Save a marine from dying of Bleeding.

Kill every Alien of a Massive Onslaught.

Prevent a marine from being Abducted.

In any mission, complete at least one objective with only one marine in the squad.

Remove a Trait from a marine.

Kill an enemy before they detect the squad.

During a campaign, unlock every Xeno Tech.

During a campaign, unlock every weapon.

During a campaign, secure 5 survivors.