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Silver bullet Obtain a silver medal in 10 different challenges

Long Bomb Kill an enemy with a Tetranite Grenade from at least 200 feet away.

Drop The Bald Defeat Lex Luthor.

Are there more than two? Find ten money bundles in PANIC ROOM.

For the Fallen Recover all 33 COG tags (on any difficulty)
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Most Escape Alive In Blood of the Dead, escape

Small Consolation In Shangri-La, use the 31-79 JGb215 on each type of zombie.

V-G-G, Vic Gotta Go! Listen to your owner's opinion on Vic.

Understanding Chose diplomacy.

Music for All Ears Reach rank 3 or higher in the Music for All Ears imp quest

Ghost Town killer Finish 'Ghost Town' on Insane

Hugs! Kill 20 enemies in a single burst of Explosive Touch in Carrier.

Grows In The Telling Complete the Story on hard difficulty.

Taster Session Try all the game modes in Single Player Race

Blinged Out Match 5000 diamonds

The Doctor is In Use PhD Slider to fall 10 feet and kill 10 zombies at once

Abandon All Hope Rescue 4 survivors in a single game of Infection.

Retire the Master Beat the City Champ.

Hacks in Stacks Stack 3 of the same hacks

Time Attack In Gorod Krovi, complete Time Attack: Round 20.

The Gold Standard Earn your 1st Gold in a Race Event (in Explore)

Sellout Spent 250,000 fans - any mode

Mi Casa Su Casa Gain access to Officer Taylor’s room.

The Highest Office In Classified, reach round 20 without using an elevator

Subzero Hero Obtain clothing to get a survivable temperature rating of -22°C / -7°F.

Third Eye Hit 20 opponents with weapons dropped as secondary weapons

Right of First Defusal Defuse 5 gas bombs in a single match in Carrier.

Movies: Gone! Escape the cops in the Shelby GT500™ (Single Player)

The Bigger They Are… Complete Collapse and Fracture in Co-Op Campaign

Brave New World Discover the Dark Playground

Web of Defeat In Zetsubou No Shima, remove webs in every possible way in one game.

Overachiever In Origins, complete all 4 Challenges in one game.

Take Off, Hoser! Ride Chompy for 5 minutes in a single match in Carrier.

Gotta Be Popular! Uwo! Uwo! My dream's to become famous, and make Mama proud! You should become famous too! Try sending or receiving 200 "Nice!" marks, for starters!
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"Puny God!" Defeat an enemy

But how? Get the armored car to drop without shooting at it in SLAUGHTERHOUSE. To complete this challenge, you will have to have played the heist from the start.

Uncle Time Finish the first mission for each of the 4 time trials.

I Can't Quit You Dom Complete all acts in co-op (on any difficulty)
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Memory's Melody Collect and listen to all records from the Forgotten Time.

LUNATIC Finish the game in Insane mode

Chasing the Game Lured and killed an alpha wyvern near Chateau Haine. ("Mark of the Assassin" downloadable content)

Easy Rhino In Dead Ops Arcade, use a Speed Boost to blast through 20 or more enemies at one time.

Zombie Fanatic In Blackout, unlock Bruno, Scarlett, Diego, Shaw, Dempsey, Takeo, Nikolai and Richtofen

Secret spotter Collect all the skittles in one level

Telefragathon Telefrag 50 enemies in a single match in Carrier.

Rags To Riches Have $1 million dollars in the bank while playing in Los Angeles.

Everything is Dust Find compound 26.

One step forward Complete Find & Replace

Prestigious Award Attain max level or Prestige with 25 different weapons in Zombies

Shinobi Bypassing all 3 consoles before raising the alarm, beat DIAMOND HEIST on hard or OVERKILL difficulty. To complete this challenge, you will have to have played the heist from the start.