Participate in all Basic Adventures' reward ceremonies
Record 2 Living Statues
Continue playing to unlock this secret achievement.
Have a friend join you while playing an activity or challenge
Kill 50 aliens with explosive weapons.
Beat the game on any difficulty.
Kill 500 aliens.
Make contact with the Ethereal hive mind.
Staff the Research Labs with 80 scientists.
Kill an alien while flying. Single player only.
Build the Gollop Chamber.
Staff the Engineering Department with 80 engineers
In a single game, complete every Autopsy.
Successfully assault an Overseer UFO.
Build the Hyperwave Relay.
Find a soldier with the Gift.
Build a suit of powered armor.
Acquire 1000 credits in one month.
Build a Firestorm.
Get satellite coverage over every country on one continent.
Build a S.H.I.V.
Build a Workshop.
Kill 150 aliens.
Advance one of your soldiers to Colonel rank.
Recover the Hyperwave Beacon.
Uncover the alien base's location.
Stun an Outsider.
Fulfill a Council request.
Build a Laboratory.
Capture a live alien.
Build a base facility.
Shoot down a UFO.
Launch a Satellite.
Become a member of the Circle
Join the Companions
Complete 50 Misc Objectives
Acquire a Daedric Artifact
Get a skill to 100
Reach Level 25
Join the Stormcloaks or the Imperial Army
Complete "The Eye of Magnus"
Complete "Revealing the Unseen"
Complete "Diplomatic Immunity"
Reach Level 10
Join the College of Winterhold
Learn all three words of a shout
Buy a house
Complete "The Way of the Voice"
Absorb a dragon soul
Complete "Bleak Falls Barrow"