Na XCOM: Enemy Unkown komt ontwikkelaar Firaxis Games met een grote uitbreiding onder de naam Enemy Within. De uitbreiding is zelfs dermate groot dat besloten is de game bij de consoles op disc uit te brengen, inclusief de volgende achievements.
Who Needs Limbs? 20
Augment a soldier in single player
A Little Bit Alien 20
Modify a soldier in single player
Enemy Within 20
Get a Soldier to have 5 modifications in single player
Steel Martyr 40
Deploy three tactical subsystems on a single soldier in single player
Apotheosis Denied 100
Deal with the newest global threat
They Shall Not Pass 20
Eliminate all alien waves
Zom-B-Gone 20
Eradicate the infestation
An Army Of Four 100
Beat the game without buying a Squad Size upgrade (Classic+ difficulty)
The Meld Squad 20
Field a fully enhanced squad and win the mission
Shieldbuster 20
Eliminate an enemy's shield and kill it on the same turn in single player
Someone Your Own Size 20
Kill a Muton Berserker in melee combat in single player
Taking A Load Off 20
Stop a squad member from suffocating in single player
Where in the World 40
Make certain of the new threat's location
Mind the Step 20
Jump two stories in one move in single player
Nice Cover 20
Use Collateral Damage to blow up a car in single player
By Our Powers Combined 40
Field a squad with 4 augmented soldiers, each with a different base ability and win the mission
Rise of the Machines 20
Field a squad consisting entirely of augmented soldiers and SHIVs (min. 4) and win the mission
Mutatis Mutandis 20
Field a squad where all members have at least two modifications (min. 4) and win the mission
Mental Minefield 40
Kill an enemy as it is psionically attacking you in single player
Anger Management 20
Proc Combat Rush on the entire squad (min. 4)
Remington… Max Remington 40
Have your special-duty soldier kill three enemies in the same mission
G’day 20
Kill an elite enemy Sniper with one of your own snipers in single player
Regenerate This 20
Kill an elite enemy Medic with explosive damage in single player
Tingling Sensation 40
Kill an unseen enemy detected by a specially modified soldier in single player
Pain in the Neck 40
Cause an enemy to suicide
Solid Prospect 20
Complete Deluge
Ours are the Furies 20
Complete Furies
Elite Defense 40
Beat a new special mission without losing any assets
Guardian of Earth 100
Designate a highly decorated soldier as the Volunteer
All Hands On Deck 20
Get at least 4 kills with XCOM Base Security personnel
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