Xyltic

Sally Likes Blood Demonstrate killer economic sensibilities by taking down 3 enemies with a single bullet.

Big Sit Ride the chairlift

Big Ride Ride the train

Big View Visit the map

Big Walk Cross the drawbridge

Little Lost Girl In Origins, release Samantha.

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

Not a Gold Digger In Origins, share a weapon you dug up.

Playing with Power In Origins, build all elemental staffs in one game.

All Your Base In Origins, activate all generators without allowing one to stop.

Kung Fu Grip In Origins, free yourself and another from the Panzer Soldat’s claw in one game.

Pop Goes the Weasel In Mob of the Dead, break the cycle.

Making the Rounds In Mob of the Dead, complete the cycle 3 times.

GG Bridge In Mob of the Dead, survive an entire round on the bridge on round 15 or higher.

Acid Drip In Mob of the Dead, convert a weapon using a kit.

No One Escapes Alive In Mob of the Dead, execute the escape plan.

Feed the Beast In Mob of the Dead, obtain Hell's Retriever.

Paranormal Progress In Mob of the Dead, open a door without spending points.

When the Revolution Comes In Buried, return to processing.

Ectoplasmic Residue In Buried, acquire a perk for free.

Candygram In Buried, make a candy delivery.

Welcome to the Club Reach Sergeant (Level 10) in multiplayer Public Match.

One Giant Leap In Moon, become trapped in the Receiving Area and free yourself through resurrection in co-op.

Big Bang Theory In Moon, gain sweet, sweet, revenge.

Cryogenic Slumber Party In Moon, complete Richtofen's grand scheme.

One Small Hack for a Man... In Moon, hack something.

Stand-in In Call of the Dead, send the crew to Paradise in solo or co-op.

Ensemble Cast In Call of the Dead, send the crew to Paradise in co-op.

Time Travel Will Tell In Shangri-La, acquire the focusing stone.

Monkey See, Monkey Don't In Shangri-La, get something from the monkeys.

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

Eaten by a Grue Play Zork on the terminal.

A safer place Sabotage the Soviet space program.

Cold Warrior Complete "Operation 40," "Vorkuta," and "Executive Order" on Veteran difficulty.

Unconventional Warfare Use the explosive bolts to kill 30 enemies in the campaign.

VIP Receive orders from Lancer.