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Finish the Prologue.
Finish the Prologue.
Prevent a marine from being Abducted.
Prevent a marine from being Abducted.
Kill every Alien of a Massive Onslaught.
Kill every Alien of a Massive Onslaught.
During a campaign, kill 100 Xenomorphs.
During a campaign, kill 100 Xenomorphs.
Save a marine from dying of Bleeding.
Save a marine from dying of Bleeding.
Kill an enemy before they detect the squad.
Kill an enemy before they detect the squad.
Complete Mission 01.
Complete Mission 01.
Remove a Trait from a marine.
Remove a Trait from a marine.
Make the ARC/APC run over an enemy.
Make the ARC/APC run over an enemy.
During a campaign, secure 5 survivors.
During a campaign, secure 5 survivors.
Secure an unconscious marine.
Secure an unconscious marine.
Complete Mission 02.
Complete Mission 02.
Kill an enemy by using an explosive barrel.
Kill an enemy by using an explosive barrel.
Complete Mission 03.
Complete Mission 03.
Complete Mission 04.
Complete Mission 04.
Have one Sentry kill at least 10 aliens.
Have one Sentry kill at least 10 aliens.
Complete Mission 05.
Complete Mission 05.
Unlock the APC.
Unlock the APC.
Complete Mission 06.
Complete Mission 06.
Complete Mission 07.
Complete Mission 07.
Complete Mission 08.
Complete Mission 08.
Destroy 4 eggs with one grenade or an RPG shot.
Destroy 4 eggs with one grenade or an RPG shot.
Complete Mission 09.
Complete Mission 09.
Advance a Sergeant to level 10.
Advance a Sergeant to level 10.
Save a Marine from being incubated.
Save a Marine from being incubated.
Advance a Gunner to level 10.
Advance a Gunner to level 10.
Complete Mission 10.
Complete Mission 10.
Complete Mission 11.
Complete Mission 11.
Complete Mission 12.
Complete Mission 12.
During a campaign, unlock every weapons.
During a campaign, unlock every weapons.
Advance a Tecker to level 10.
Advance a Tecker to level 10.
Advance a Recon to level 10.
Advance a Recon to level 10.
Advance a Medic to level 10.
Advance a Medic to level 10.
Kill every Queen during a campaign.
Kill every Queen during a campaign.
Lure a Queen into a Mine.
Lure a Queen into a Mine.
Finish the game on Medium.
Finish the game on Medium.
In any mission, complete at least one objective with only one marine in the squad.
In any mission, complete at least one objective with only one marine in the squad.
Keep all of your marines alive during a campaign.
Keep all of your marines alive during a campaign.
During a campaign, advance each Marine Class to level 10.
During a campaign, advance each Marine Class to level 10.
During a campaign, unlock every Xeno Tech.
During a campaign, unlock every Xeno Tech.
Finish the game on Hard.
Finish the game on Hard.
Gather all datapads.
Gather all datapads.
Have a marine with at least 2 Prostheses.
Have a marine with at least 2 Prostheses.
Finish the game on "No One Can Hear Them Scream" mode.
Finish the game on "No One Can Hear Them Scream" mode.
Finish the game on Nightmare.
Finish the game on Nightmare.