CosmoYurri

A Harsh Reality Escape the care center.

Slippery When Undead In Die Rise, kill 5 zombies with a single shot from the Sliquifier.

I'm My Own Best Friend In Die Rise, revive yourself.

Can I Borrow This? Throw a weapon dropped by an enemy.

It's Been a Long Night Reach the courtyard of the care center.

FSIRT Against the Wall In Buried, purchase the LSAT off the wall and Pack-a-Punch it.

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

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

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

Insert Coin Access the terminal and battle the forces of the Cosmic Silverback in Dead Ops Arcade.

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

Quiet on the Set In Call of the Dead, cut the lights on the Director.

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.

Bring Out the Big Guns Stun the Girl with Requiem.

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

Zomb Disposal In Shangri-La, dispose of a Napalm zombie without it harming any players.

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

They are going THROUGH! In Ascension, kill at least 5 zombies with 1 Gersh Device.

The eagle has landers In Ascension, escape on all 3 lunar landers.

Hands Off the Merchandise Kill the Pentagon thief before it can steal your load-out.

Just ask me nicely Break free from the torture chair.

Revisionist Historian In Buried, rewrite history.

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

When the Revolution Comes In Buried, return to processing.

I'm Your Huckleberry In Buried, access all areas with the help of your new friend in one game.

Vertigoner In Die Rise, fling 10 zombies in one game.

Just Gettin' Started Complete 1 challenge in any level.

No Man Left Behind Rescue Woods.

Gun Nut Complete a level with customized loadout.

Big Leagues Start the Campaign.

Untouchable Parry an enemy attack.

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

Candygram In Buried, make a candy delivery.

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

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

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

Ectoplasmic Residue In Buried, acquire a perk for free.

Fuel Efficient In TranZit, use an alternative mode of transportation.

I Don't Think They Exist In TranZit, kill one of the denizens of the forest while it is latched onto you.

Internal Dispute Make a zombie attack another zombie in the hospital wards.

Chop Chop Defeat three zombies with a hatchet finishing attack.

Tailor Made Upgrade a weapon.

Descent Into Darkness Reach the basement of the care center.

Blood! More Blood! Use 300 microsamples of infected blood.

Deadly Duet Defeat the two singers in the main story.

Order Up! Defeat the chef in the care center in the main story.

The Power of Blood Craft an item using the blood collector.

Fatal Dose Defeat a zombie using the hemolytic injector.

Like Mother, Like Daughter Unlock a drawer with a lockpick.