XCOM: Enemy Unknown

We Happy Few

Very common87.5%

Complete a mission without losing a soldier.

Combat Ready

Very common86.8%

Build an item.

What Wonders Await

Very common86.8%

Complete a Research Project.

And So It Begins…

Very common84.0%

Complete the tutorial mission.

Eye in the Sky

Very common82.5%

Launch a Satellite.

Tables Turned

Very common82.1%

Shoot down a UFO.

Up and Running

Very common79.7%

Build a base facility.

Happy to Oblige

Very common72.1%

Fulfill a Council request.

...and Practice.

Common64.0%

Build a Workshop.

Welcoming Committee

Common63.8%

Kill 150 aliens.

Theory...

Common58.1%

Build a Laboratory.

The Hardest Road

Common57.7%

Advance one of your soldiers to Colonel rank.

As A Scalpel

Common51.8%

Earn the "Excellent" rating in every performance category on a terror mission.

All Together Now

Common51.3%

Get satellite coverage over every country on one continent.

Man No More

Common49.7%

Build a suit of powered armor.

Worth Every Penny

Common49.1%

Acquire 1000 credits in one month.

Drums in the Deep

Common46.1%

Gain access to the lowest level in your base.

Pale Horse

Common40.8%

Kill 500 aliens.

All Employees Must Wash Hands…

Common40.2%

In a single game, complete every Autopsy.

You Have 5 Seconds to Comply

Common40.0%

Build a S.H.I.V.

Bada Boom

Uncommon38.3%

Kill 50 aliens with explosive weapons.

Taking A Load Off

Uncommon35.7%

Stop a squad member from suffocating in single player

One Gun at a Time

Uncommon33.5%

Staff the Engineering Department with 80 engineers.

Humanity's Savior

Uncommon31.6%

Beat the game on any difficulty.

Oppenheimer

Uncommon30.5%

Staff the Research Labs with 80 scientists.

A Little Bit Alien

Uncommon28.6%

Modify a soldier in single player

Who Needs Limbs?

Uncommon28.5%

Augment a soldier in single player

Flight of the Valkyries

Uncommon27.7%

Win a mission with an all-female squad. Single player only.

Elite Defense

Uncommon26.8%

Beat a new special mission without losing any assets

Zom-B-Gone

Uncommon25.5%

Eradicate the infestation

Shieldbuster

Uncommon25.3%

Eliminate an enemy's shield and kill it on the same turn in single player

G’day

Uncommon23.2%

Kill an elite enemy Sniper with one of your own snipers in single player

Angel of Death

Uncommon23.0%

Kill an alien while flying. Single player only.

They Shall Not Pass

Uncommon22.1%

Eliminate all alien waves

All Hands on Deck

Uncommon20.4%

Get at least 4 kills with XCOM Base Security personnel

Solid Prospect

Uncommon19.5%

Complete Deluge

Regenerate This

Uncommon19.3%

Kill an elite enemy Medic with explosive damage in single player

Apotheosis Denied

Uncommon18.8%

Deal with the newest global threat

Steel Martyr

Uncommon18.6%

Deploy three tactical subsystems on a single soldier in single player

Hunter/Killer

Uncommon18.2%

In a single game, shoot down one of each alien craft.

Ours are the Furies

Uncommon17.8%

Complete Furies

Pain in the Neck

Uncommon16.5%

Cause an enemy to suicide

Where in the World

Uncommon15.5%

Make certain of the new threat's location

Mind the Step

Uncommon15.2%

Jump two stories in one move in single player

Skunkworks

Uncommon13.6%

In a single game, complete every Foundry project.

Enemy Within

Uncommon13.3%

Get a Soldier to have 5 modifications in single player

Nice Cover

Uncommon12.8%

Use Collateral Damage to blow up a car in single player

Remington… Max Remington

Uncommon12.4%

Have your special-duty soldier kill three enemies in the same mission

Someone Your Own Size

Uncommon11.9%

Kill a Muton Berserker in melee combat in single player

The Meld Squad

Uncommon11.8%

Field a fully enhanced squad and win the mission

Anger Management

Uncommon11.3%

Proc Combat Rush on the entire squad (min. 4)

Meet New People. Then Kill Them.

Rare9.1%

Win a multiplayer match.

Edison

Rare8.2%

In a single game, complete every Research Project.

Shooting Stars

Rare8.1%

Shoot down 40 UFOs.

Bubonic

Rare6.7%

Play a multiplayer match against someone with this achievement.

Xavier

Rare6.0%

Mind Control an Ethereal. Single player only.

Wet Work

Rare5.8%

Complete a Very Hard abduction mission in five turns or less on Classic or Impossible difficulty.

Earth First

Rare5.5%

Beat the game on Classic difficulty.

Tingling Sensation

Rare5.4%

Kill an unseen enemy detected by a specially modified soldier in single player

Mental Minefield

Very rare4.7%

Kill an enemy as it is psionically attacking you in single player

Mutatis Mutandis

Very rare4.3%

Field a squad where all members have at least two modifications (min. 4) and win the mission

Rise of the Machines

Very rare3.2%

Field a squad consisting entirely of augmented soldiers and SHIVs (min. 4) and win the mission

Guardian of Earth

Very rare2.4%

Designate a highly decorated soldier as the Volunteer

By Our Powers Combined

Very rare2.2%

Field a squad with 4 augmented soldiers, each with a different base ability and win the mission

Ain't No Cavalry Comin'

Very rare2.0%

Have a soldier survive every mission in a full game.

No Looking Back

Very rare2.0%

Beat the game in Ironman mode on Classic or Impossible Difficulty.

Lone Wolf

Very rare1.8%

Clear a UFO crash site with one soldier on Classic or Impossible difficulty.

Our Finest Hour

Very rare1.4%

Beat the game on Impossible difficulty.

An Army Of Four

Very rare1.0%

Beat the game without buying a Squad Size upgrade (Classic+ difficulty)

A Continental Fellow

Ultra rare0.8%

Win the game from each of the 5 starting locations.