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No Zombies in the Vents Unlock the secret shortcut.

Star struck Get 3 Stars on 10 different Echoes

Egg-stra XP! Complete the Egg-Stra XP challenge and then destroy a hive in the Onslaught DLC package.

They See You Rollin' Earn 3,141 badges

Social Butterfly Complete one event with each constructor

Untouchable Use only one self revive care package in the "Special Delivery" Special Ops mission.

Big Brawler Get 10 consecutive zombie melee kills before Insta-Kill expires. (Map Pack 2 only)

Write Off Kill 500 Enemies using an Insured Weapon in MWZ

Genpei Demon Completed all missions in "The Tengu's Disciple" on Dream of the Demon. (Does not include Twilight or training missions.)
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Full Marks Infiltration - Complete all the Challenges

Guerrilla Tactics Execute at least 25 different Skillshots in one Echo round

Favorite One Achieve Top Manager Rating Values with your current player

Frequent Flyer BASE jump and travel more than 150 m with your parachute

Well, what did you achieve? Finish all episodes on insane or extreme difficulty

Fling Me to the Moon In Der Eisendrache, use every Wundersphere twice.

Massacre Kill 10 aliens with one shot (or witness another player doing this).

I never doubted you! Win 10 Rounds of Infiltration

dr0n3d Complete the "Arctic Recon" Special Ops mission in under 3:30.

High Roller Complete the "Iron Clad" Special Ops mission on Veteran difficulty.

Got All I Need Complete a mission without using aid kits, ammo crates, or consumables.

Eating Your Cake Too Finish a 10th run

Perk-a-Holic Have all four perks simultaneously active in a game of Nazi Zombies. (Map Pack 2 only)

Mixed Messages Take a picture with elements of horror, brutality, outtake and erotica in a single shot.

A Big Fan of Lefties Acquire all enemy officers' left arms.

Skilled Adversary In IX have a Challenge banner with all 9 medallions

Enforcer Get at least 15,000 points in one Echo round

Swimming with the Fishes In Voyage of Despair, kill 50 zombies that are underwater in a single game

Extinguisher In the Sewer map, kill 5 enemies in 1 wave by setting them on fire then extinguishing them

Imposing arsenal Open and buy final versions of all weapons

Seek & Destroy Get 2 Kills with a single remote controlled Throwing Knife from at least 50 meters away in Campaign

Assist Deal more than 50% of the damage to an enemy killed by another player.

Go for Gold! In Onslaught, acquire seven gold chalices

Technological Terror Destroy a "harvester."

Pure Pawn In single player Story mode, sell 10000 credits worth of items or ammunition.

You have your moments Get 5000 Objective Score while playing as any Hero (Multiplayer)

Pea Shooter Kill a Rhino with only a pistol in Nightfall in Regular or Hardcore difficulty.

40 Knives! Kill 40 zombies with the bowie knife. (Map Pack 3 only)

Son of Liberty Earn 20 individual citations.

Factory Zero You survived Hei Zhen Zhu and RBS using no Praxis kits, weapons, grenades or mines. Whoa.

Perkaholics Anonymous! Survive until round 20 without buying a single Perk. (Map Pack 3 only)

I've not seen such bravery! Complete all Trophies in Gauntlet™

Frequent Flyer! Use the teleporter 8 times. (Map Pack 3 only)

Knowledge is Power Collect all logs through out the game.

Heian Demon Completed all missions in "Darkness in the Capital" on Dream of the Demon.
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Come Back To Me Kill a Sectoid who is currently mind controlling a squadmate

In the Game Play a women's football match

Pack-A-Punch-ectomy In Revelations, recover the Pack-a-Punch machine from its abductor.

Skewer the Winged Beast In Under the Radar, have the SAM target itself and the helicopter

Hoarder Have a total of at least 250,000 points in Echoes Mode's total high score

Utility Man Complete all Missions intercepted from cellular tower signals