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85 of 85 (100%) achievements earned:
Personal Achievements
 

No Looking Back

Beat the game in Ironman mode on Classic or Impossible Difficulty.
Unlocked 3 Aug, 2013 @ 8:17pm

Meet New People. Then Kill Them.

Win a multiplayer match.
Unlocked 2 Jun, 2013 @ 6:38pm

Xavier

Mind Control an Ethereal. Single player only.
Unlocked 21 May, 2013 @ 8:09pm

Humanity's Savior

Beat the game on any difficulty.
Unlocked 21 May, 2013 @ 11:45pm

Earth First

Beat the game on Classic difficulty.
Unlocked 26 Jun, 2013 @ 10:08pm

Our Finest Hour

Beat the game on Impossible difficulty.
Unlocked 26 Jun, 2013 @ 10:08pm

Lone Wolf

Clear a UFO crash site with one soldier on Classic or Impossible difficulty.
Unlocked 3 Aug, 2013 @ 9:09pm

Bada Boom

Kill 50 aliens with explosive weapons.
Unlocked 21 May, 2013 @ 10:40pm

Welcoming Committee

Kill 150 aliens.
Unlocked 16 May, 2013 @ 11:22pm

Pale Horse

Kill 500 aliens.
Unlocked 20 May, 2013 @ 4:22pm

Shooting Stars

Shoot down 40 UFOs.
Unlocked 24 May, 2013 @ 4:16pm

Ain't No Cavalry Comin'

Have a soldier survive every mission in a full game.
Unlocked 28 May, 2013 @ 11:44pm

As A Scalpel

Earn the "Excellent" rating in every performance category on a terror mission.
Unlocked 16 May, 2013 @ 10:12pm

Edison

In a single game, complete every Research Project.
Unlocked 21 May, 2013 @ 8:58pm

Angel of Death

Kill an alien while flying. Single player only.
Unlocked 19 May, 2013 @ 5:17pm

All Employees Must Wash Hands…

In a single game, complete every Autopsy.
Unlocked 21 May, 2013 @ 8:19pm

Beyond the Veil

Find a soldier with the Gift.
Unlocked 20 May, 2013 @ 4:31pm

Prisoner of War

Capture a live alien.
Unlocked 14 May, 2013 @ 1:07am

The Gatekeeper

Stun an Outsider.
Unlocked 14 May, 2013 @ 11:52pm

X Marks the Spot

Uncover the alien base's location.
Unlocked 15 May, 2013 @ 12:38am

See All, Know All

Build the Hyperwave Relay.
Unlocked 20 May, 2013 @ 11:01pm

On the Shoulders of Giants

Build the Gollop Chamber.
Unlocked 21 May, 2013 @ 9:00pm

Ride the Lightning

Build a Firestorm.
Unlocked 19 May, 2013 @ 2:23pm

Eye in the Sky

Launch a Satellite.
Unlocked 14 May, 2013 @ 12:23am

All Together Now

Get satellite coverage over every country on one continent.
Unlocked 19 May, 2013 @ 12:22pm

Hunter/Killer

In a single game, shoot down one of each alien craft.
Unlocked 21 May, 2013 @ 7:22pm

Man No More

Build a suit of powered armor.
Unlocked 19 May, 2013 @ 4:21pm

Bubonic

Play a multiplayer match against someone with this achievement.
Unlocked 29 May, 2013 @ 12:00am

We Happy Few

Complete a mission without losing a soldier.
Unlocked 13 May, 2013 @ 11:09pm

The Hardest Road

Advance one of your soldiers to Colonel rank.
Unlocked 16 May, 2013 @ 11:34pm

Worth Every Penny

Acquire 1000 credits in one month.
Unlocked 19 May, 2013 @ 1:02pm

Oppenheimer

Staff the Research Labs with 80 scientists.
Unlocked 20 May, 2013 @ 5:50pm

One Gun at a Time

Staff the Engineering Department with 80 engineers.
Unlocked 20 May, 2013 @ 4:31pm

Skunkworks

In a single game, complete every Foundry project.
Unlocked 21 May, 2013 @ 7:17pm

You Have 5 Seconds to Comply

Build a S.H.I.V.
Unlocked 20 May, 2013 @ 6:58pm

Theory...

Build a Laboratory.
Unlocked 14 May, 2013 @ 10:51pm

...and Practice.

Build a Workshop.
Unlocked 15 May, 2013 @ 12:34am

Wet Work

Complete a Very Hard abduction mission in five turns or less on Classic or Impossible difficulty.
Unlocked 13 Aug, 2013 @ 5:46pm

A Continental Fellow

Win the game from each of the 5 starting locations.
Unlocked 3 Aug, 2013 @ 8:17pm

What Wonders Await

Complete a Research Project.
Unlocked 13 May, 2013 @ 11:18pm

Up and Running

Build a base facility.
Unlocked 14 May, 2013 @ 12:56am

Combat Ready

Build an item.
Unlocked 13 May, 2013 @ 11:20pm

Drums in the Deep

Gain access to the lowest level in your base.
Unlocked 16 May, 2013 @ 11:14pm

Happy to Oblige

Fulfill a Council request.
Unlocked 14 May, 2013 @ 11:35pm

And Hell's Coming With Me

Successfully assault an Overseer UFO.
Unlocked 21 May, 2013 @ 8:15pm

Off My Planet

Recover the Hyperwave Beacon.
Unlocked 19 May, 2013 @ 6:36pm

Tables Turned

Shoot down a UFO.
Unlocked 14 May, 2013 @ 12:25am

And So It Begins…

Complete the tutorial mission.
Unlocked 13 May, 2013 @ 7:05pm

The Volunteer

Make contact with the Ethereal hive mind.
Unlocked 21 May, 2013 @ 10:42pm

Flight of the Valkyries

Win a mission with an all-female squad. Single player only.
Unlocked 3 Aug, 2013 @ 9:09pm

New Friend

Complete Friends in Low Places.
Unlocked 14 May, 2013 @ 1:29am

Bait the Hook

Complete Confounding Light.
Unlocked 15 May, 2013 @ 1:15am

The Bigger They Are

Complete Gangplank.
Unlocked 16 May, 2013 @ 9:34pm

Rising Dragon

Take your new ally into the final challenge.
Unlocked 21 May, 2013 @ 10:46pm

All Aboard

Complete Confounding Light with more than 3 turns left on the timer.
Unlocked 2 Jun, 2013 @ 7:08pm

Who Needs Limbs?

Augment a soldier in single player
Unlocked 10 Feb, 2014 @ 9:32pm

A Little Bit Alien

Modify a soldier in single player
Unlocked 10 Feb, 2014 @ 9:56pm

Enemy Within

Get a Soldier to have 5 modifications in single player
Unlocked 11 Feb, 2014 @ 6:48pm

Steel Martyr

Deploy three tactical subsystems on a single soldier in single player
Unlocked 10 Feb, 2014 @ 10:06pm

Apotheosis Denied

Deal with the newest global threat
Unlocked 11 Feb, 2014 @ 6:40pm

They Shall Not Pass

Eliminate all alien waves
Unlocked 12 Feb, 2014 @ 8:38pm

Zom-B-Gone

Eradicate the infestation
Unlocked 10 Feb, 2014 @ 9:30pm

An Army Of Four

Beat the game without buying a Squad Size upgrade (Classic+ difficulty)
Unlocked 18 Feb, 2014 @ 11:05pm

The Meld Squad

Field a fully enhanced squad and win the mission
Unlocked 10 Feb, 2014 @ 11:34pm

Shieldbuster

Eliminate an enemy's shield and kill it on the same turn in single player
Unlocked 8 Feb, 2014 @ 10:24am

Someone Your Own Size

Kill a Muton Berserker in melee combat in single player
Unlocked 11 Feb, 2014 @ 5:53pm

Taking A Load Off

Stop a squad member from suffocating in single player
Unlocked 2 Feb, 2014 @ 4:59pm

Where in the World

Make certain of the new threat's location
Unlocked 11 Feb, 2014 @ 12:03am

Mind the Step

Jump two stories in one move in single player
Unlocked 10 Feb, 2014 @ 10:46pm

Nice Cover

Use Collateral Damage to blow up a car in single player
Unlocked 10 Feb, 2014 @ 10:10pm

By Our Powers Combined

Field a squad with 4 augmented soldiers, each with a different base ability and win the mission
Unlocked 11 Feb, 2014 @ 12:34am

Rise of the Machines

Field a squad consisting entirely of augmented soldiers and SHIVs (min. 4) and win the mission
Unlocked 11 Feb, 2014 @ 12:34am

Mutatis Mutandis

Field a squad where all members have at least two modifications (min. 4) and win the mission
Unlocked 10 Feb, 2014 @ 11:34pm

Mental Minefield

Kill an enemy as it is psionically attacking you in single player
Unlocked 18 Feb, 2014 @ 10:03pm

Anger Management

Proc Combat Rush on the entire squad (min. 4)
Unlocked 10 Feb, 2014 @ 10:56pm

Remington… Max Remington

Have your special-duty soldier kill three enemies in the same mission
Unlocked 10 Feb, 2014 @ 9:24am

G’day

Kill an elite enemy Sniper with one of your own snipers in single player
Unlocked 10 Feb, 2014 @ 1:52pm

Regenerate This

Kill an elite enemy Medic with explosive damage in single player
Unlocked 10 Feb, 2014 @ 1:56pm

Tingling Sensation

Kill an unseen enemy detected by a specially modified soldier in single player
Unlocked 10 Feb, 2014 @ 10:48pm

Pain in the Neck

Cause an enemy to suicide
Unlocked 7 Feb, 2014 @ 8:06pm

Solid Prospect

Complete Deluge
Unlocked 12 Feb, 2014 @ 9:19pm

Ours are the Furies

Complete Furies
Unlocked 13 Feb, 2014 @ 8:04pm

Elite Defense

Beat a new special mission without losing any assets
Unlocked 8 Feb, 2014 @ 9:09am

Guardian of Earth

Designate a highly decorated soldier as the Volunteer
Unlocked 18 Feb, 2014 @ 10:15pm

All Hands on Deck

Get at least 4 kills with XCOM Base Security personnel
Unlocked 12 Feb, 2014 @ 7:16pm