Complete a mission without losing a soldier.

Build an item.

Complete a Research Project.

Complete the tutorial mission.

Launch a Satellite.

Shoot down a UFO.

Build a base facility.

Fulfill a Council request.

Capture a live alien.

Stun an Outsider.

Build a Workshop.

Kill 150 aliens.

Uncover the alien base's location.

Build a Laboratory.

Advance one of your soldiers to Colonel rank.

Recover the Hyperwave Beacon.

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

Get satellite coverage over every country on one continent.

Build a suit of powered armor.

Acquire 1000 credits in one month.

Build a Firestorm.

Gain access to the lowest level in your base.

Build the Hyperwave Relay.

Find a soldier with the Gift.

Successfully assault an Overseer UFO.

Kill 500 aliens.

In a single game, complete every Autopsy.

Build a S.H.I.V.

Build the Gollop Chamber.

Kill 50 aliens with explosive weapons.

Make contact with the Ethereal hive mind.

Stop a squad member from suffocating in single player

Staff the Engineering Department with 80 engineers.

Complete Friends in Low Places.

Beat the game on any difficulty.

Staff the Research Labs with 80 scientists.

Complete Confounding Light.

Modify a soldier in single player

Augment a soldier in single player

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

Beat a new special mission without losing any assets

Complete Gangplank.

Eradicate the infestation

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

Kill an alien while flying. Single player only.

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

Eliminate all alien waves

Get at least 4 kills with XCOM Base Security personnel

Complete Deluge

Kill an elite enemy Medic with explosive damage in single player

Deal with the newest global threat

Deploy three tactical subsystems on a single soldier in single player

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

Complete Furies

Cause an enemy to suicide

Make certain of the new threat's location

Jump two stories in one move in single player

In a single game, complete every Foundry project.

Get a Soldier to have 5 modifications in single player

Use Collateral Damage to blow up a car in single player

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

Kill a Muton Berserker in melee combat in single player

Field a fully enhanced squad and win the mission

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

Win a multiplayer match.

In a single game, complete every Research Project.

Take your new ally into the final challenge.

Play a multiplayer match against someone with this achievement.

Mind Control an Ethereal. Single player only.

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

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

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

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

Designate a highly decorated soldier as the Volunteer

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