XCOM: Enemy Unknown

No Looking Back

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

Meet New People. Then Kill Them.

Win a multiplayer match.

Xavier

Mind Control an Ethereal. Single player only.

Humanity's Savior

Beat the game on any difficulty.

Earth First

Beat the game on Classic difficulty.

Our Finest Hour

Beat the game on Impossible difficulty.

Lone Wolf

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

Bada Boom

Kill 50 aliens with explosive weapons.

Welcoming Committee

Kill 150 aliens.

Pale Horse

Kill 500 aliens.

Shooting Stars

Shoot down 40 UFOs.

Ain't No Cavalry Comin'

Have a soldier survive every mission in a full game.

As A Scalpel

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

Edison

In a single game, complete every Research Project.

Angel of Death

Kill an alien while flying. Single player only.

All Employees Must Wash Hands…

In a single game, complete every Autopsy.

Beyond the Veil

Hidden achievement

Prisoner of War

Hidden achievement

The Gatekeeper

Hidden achievement

X Marks the Spot

Hidden achievement

See All, Know All

Hidden achievement

On the Shoulders of Giants

Hidden achievement

Ride the Lightning

Hidden achievement

Eye in the Sky

Launch a Satellite.

All Together Now

Get satellite coverage over every country on one continent.

Hunter/Killer

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

Man No More

Build a suit of powered armor.

Bubonic

Play a multiplayer match against someone with this achievement.

We Happy Few

Complete a mission without losing a soldier.

The Hardest Road

Advance one of your soldiers to Colonel rank.

Worth Every Penny

Acquire 1000 credits in one month.

Oppenheimer

Staff the Research Labs with 80 scientists.

One Gun at a Time

Staff the Engineering Department with 80 engineers.

Skunkworks

In a single game, complete every Foundry project.

You Have 5 Seconds to Comply

Build a S.H.I.V.

Theory...

Build a Laboratory.

...and Practice.

Build a Workshop.

Wet Work

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

A Continental Fellow

Win the game from each of the 5 starting locations.

What Wonders Await

Complete a Research Project.

Up and Running

Build a base facility.

Combat Ready

Build an item.

Drums in the Deep

Gain access to the lowest level in your base.

Happy to Oblige

Fulfill a Council request.

And Hell's Coming With Me

Hidden achievement

Off My Planet

Hidden achievement

Tables Turned

Shoot down a UFO.

And So It Begins…

Complete the tutorial mission.

The Volunteer

Hidden achievement

Flight of the Valkyries

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

New Friend

Hidden achievement

Bait the Hook

Hidden achievement

The Bigger They Are

Hidden achievement

Rising Dragon

Hidden achievement

All Aboard

Hidden achievement

Who Needs Limbs?

Augment a soldier in single player

A Little Bit Alien

Modify a soldier in single player

Enemy Within

Get a Soldier to have 5 modifications in single player

Steel Martyr

Deploy three tactical subsystems on a single soldier in single player

Apotheosis Denied

Deal with the newest global threat

They Shall Not Pass

Eliminate all alien waves

Zom-B-Gone

Eradicate the infestation

An Army Of Four

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

The Meld Squad

Field a fully enhanced squad and win the mission

Shieldbuster

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

Someone Your Own Size

Kill a Muton Berserker in melee combat in single player

Taking A Load Off

Stop a squad member from suffocating in single player

Where in the World

Make certain of the new threat's location

Mind the Step

Jump two stories in one move in single player

Nice Cover

Use Collateral Damage to blow up a car in single player

By Our Powers Combined

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

Rise of the Machines

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

Mutatis Mutandis

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

Mental Minefield

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

Anger Management

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

Remington… Max Remington

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

G’day

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

Regenerate This

Kill an elite enemy Medic with explosive damage in single player

Tingling Sensation

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

Pain in the Neck

Cause an enemy to suicide

Solid Prospect

Complete Deluge

Ours are the Furies

Complete Furies

Elite Defense

Beat a new special mission without losing any assets

Guardian of Earth

Designate a highly decorated soldier as the Volunteer

All Hands on Deck

Get at least 4 kills with XCOM Base Security personnel