Build a Workshop.
Kill 150 aliens.
Advance one of your soldiers to Colonel rank.
Uncover the alien base's location.
Stun an Outsider.
Fulfill a Council request.
Capture a live alien.
Build a base facility.
Shoot down a UFO.
Launch a Satellite.
Build an item.
Complete a Research Project.
Complete a mission without losing a soldier.
Complete the tutorial mission.
Fully mod and completely upgrade all weapons.
Purchase all skills in all categories.
Complete the game.
Kill and loot 10 flying animals (crows and gulls).
Find 75% of GPS caches.
Complete all optional tombs.
Collect 75% of all relics.
Find 75% of all documents.
Kill 40 enemies with the shotgun.
Fully mod and completely upgrade any weapon.
Kill and loot 10 small animals (rabbits, chickens, rats).
Continue playing to unlock this secret achievement.
Purchase all skills in one category.
Loot 200 enemies.
Kill 25 unaware enemies.
Collect 25% of all relics.
Collect 5000 pieces of salvage.
Kill 50 enemies with the bow.
Find 25% of GPS caches.
Force an enemy to drop dynamite that kills two people when exploding.
Complete one challenge.
Kill and loot 10 large animals (deer, boar, wolves).
Perform 15 finishers.
In the Main Campaign, completed Lighthouse.
Complete 2 cooking puzzles.
Complete the Bonus Level.
Complete 'Mount Doom'.
Complete 'The Black Gate'.
Complete 'The Battle of Pelennor Fields'.
Defeat an Oliphaunt as Legolas.
Complete 'Helm's Deep'.
Finish one of Gimli's opponents as Legolas in 'Helm's Deep'.
Complete 'The Paths of the Dead'.
Walk into Mordor.
Complete 'Cirith Ungol'.