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Undiscovered Truths Find all the intel hidden in Nightfall.

Burgertown Escort Service Rescue 1 survivor in Infection.

No Swimming Should have brought a swimming suit.

Two's Company, Four's a Party Complete any Adventure level with 4 players.

Just Like Old Times Dispatch the professor with a shot to the groin.

Beeep! Express checkout

Change For Gas I wish I had an electric car.

Come On And ... Slam 10 zombies at once in Outbreak.

Bike Win 5 Festival races using a Bike

Acquire Waffle Weapons! Obtain the Ray Gun, DG-2, and the Monkey Bomb at the same time in a game. (Map Pack 3 only)

Is She Ok?! You Should Check Her State

Don't Tell Anyone! The crime levels have never been lower.

Deliver This Complete the "Special Delivery" Special Ops mission on Veteran difficulty.

Chuck Greene: Cross-dresser? Change into all pieces of clothing in the game

Tag, You're it! Use the Spotter Scope to tag 60 enemies or items in Open Combat Missions

Invincible Get 99 or more extra lives.

Platinum Unlock all trophies.

Invisible Complete every chapter without being seen.

Blazingstar Obtain 3 stars on level 7

Acidic Alchemy In IX, Get a kill with the Acid Trap in each of its craftable locations

I Know a Shortcut In Voyage of Despair, take every fast travel path in a single game

You Shall Not Pass! Defeat the Balrog as Gandalf in the Mines of Moria ("War of the Ring" Campaign).

So Euro Enable European competition in the first season of Career

2-fer Using the EBR-14, kill 2 enemies with 1 bullet 5 times in 'Payload' without sounding the alarm

Elevator Out of Order Reach the roof in 'Highrise' under 45 seconds

Streak Kill 50 enemies without taking damage

Fatso Be stuffed to bursting for two days.

He Talked Too Much Defeat Emerson Miller

Up Up! Leap of Faith In the Closet

Get'em George Learn to standup for yourself

Top Of The World How far can you see

Mountain legend Complete 30 MOUNTAIN STORIES in Alps

All's Well as Ends Better Complete the single player "War of the Ring" Campaign.

Gravestone Kill 100 Zombies with a vehicle in a single deployment in MWZ

Flyswatter Destroy all helicopters in the "Vertigo" Special Ops mission.

That Still Only Counts as One Climb and kill an Oliphaunt.

Winning Streak Awarded for winning 10 consecutive matches.

Master Key Collect all the runes

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

Pinnacle Complete the "Vertigo" Special Ops mission on Veteran difficulty.

A Little Pack Here, a Little Punch There In Voyage of Despair, use the Pack-a-Punch at every possible location in a single game

High Score In Zombie Rush, obtain a Personal Score of 250,000

Song of Torukä Na'rìng Secure the song in Torukä Na'rìng.

Comprehensive Showing Post a result online for every Challenge for your Friends to compare.

Allstar Obtain 3 stars on level 8

Back in the Field Acquire the Major's keycard in 'Deep Cover' within 90 seconds without being detected

Alright, Alright Survive until round 10 in Infection.

Deadhead Get 150 zombie headshots in a single game. (Map Pack 2 only)

Quibbler Collector Collect half of all the copies of The Quibbler.

That Party was Ace Ace every Adventure level in The Journey Home.