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

Donut Mess with a Cop Unlock Officer Dick.

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

Alright, Alright Survive until round 10 in Infection.

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

Survivor Survive until Round 25 in Outbreak.

High Wire Act Kill 10 enemies while using a zipline

The Ultimate Sacrifice In Zetsubou No Shima, retrieve the Skull of Nan Sapwe.

PC Load Letter Use the 3D printer 15 times in a single match in Outbreak.

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

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

Going to the Vet Earn the "Veteran" Challenge Collection.
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Icy Roads Ahead Win any race that includes sections of Hot Wheels Ice Track

A Bridge To Somewhere Extend the bridge in Awakening in Regular or Hardcore difficulty.

Heavy Ordinance Specialist Destroy 50 Aerial Scorestreaks with Launchers in Multiplayer

To Jugger or to Jugger-Naut Kill all juggernauts after they land on Veteran difficulty in the "Vertigo" Special Ops mission.

The Most Famous Hedgehog in the World Have your photos taken in Studiopolis Zone

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

That's One Way to Do It... Destroy an airborne enemy helicopter with a Mortar Strike

Perkaholic Have 9 perks active at the same time in MWZ

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

Get him! Win a Quick Race on a track in the Batcave (not unlockable in Split Screen).

Escaped Awakening Escape Awakening for the first time in Regular or Hardcore difficulty.

Maniac Get an S-Rank on all stages on Hard difficulty or higher.

It's a Trap! Kill at least one zombie with three different traps in a single round. (Map Pack 2 only)

Annihilation Get 100 Elite Zombie Eliminations in Zombies

Attracted to Victory Win any race that includes sections of Hot Wheels Magnet Track

Magical Sound Shower Race to every piece of music.

Sack the Postman Post all 6 invitations for the party.

141 Ready Complete the campaign on Veteran

No Mo' Modi Get out of jail, but not for free

Bleeding Knuckles Reach a lifetime score of 5,000,000.

Fighters Megamix Take out an opponent with each character's All-Star Move.

Egg-stra Awakening! Complete the Egg-Stra XP challenge and then scan an obelisk in the Invasion DLC package.

It's a Trap! In Shi No Numa, kill at least one zombie with three different traps in a single round.

Nightfall Completionist Complete all challenges and kill the Breeder in Nightfall in Regular or Hardcore difficulty.

Going Up… In The Darkest Shore, unlock the Ubersprengen.

Controlled Chaos In Revelations, override all of the Corruption Engines before round 6.

Turnabout is Fair Play Kill 50 Cryptids with the Venom-X weapon in Nightfall in Regular or Hardcore difficulty.

Dipped in Gold Purchase all Safehouse and Player Upgrades in Campaign

Not One Inch In Gorod Krovi, complete a Lockdown Event.

Golden Acts Earn your GOLD SEGA License.

May Your Death Be Swift Win a Daily Run of No Return on Grounded difficulty

Upping the Ante Kill the Kraken using a Relic in Mayday in Regular or Hardcore difficulty.

Cyberized Research all Augments for 10 Items in Zombies

Muppet Mastery Complete The Muppet pack's story

The Professional Complete your first Pro Tour race online

Back From The Dead Reclaim your gear from a Tombstone in MWZ

No Such Thing as Too Many Find and use all Armaments in Open Combat Missions

Hat Trick Kill 3 aliens with a single shot from the NX-1 Disruptor in Regular or Hardcore difficulty.