S2Dubs

Death Ray In Revelations, kill 40 enemies with a single activation of a Corruption Turret.

Ground Control In Moon, prevent each excavator from breaching the base in one game.

Cryogenic Slumber Party In Moon, complete Richtofen's Grand Scheme.

Mazed and Confused In Buried, survive an entire round within the maze on round 20 or higher.

Revisionist Historian In Buried, rewrite history.

Death From Below In Buried, drop the beat on 10 zombies in one game.

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

When the Revolution Comes In Buried, return to processing.

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

Ectoplasmic Residue In Buried, acquire a perk for free.

Candygram In Buried, make a candy delivery.

Time Travel Will Tell In Shangri-La, acquire the Focusing Stone.

Acted Alone In Verrückt, headshot 20 zombies in the courtyard from the second floor of the Asylum.

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

Broken English Escape Kowloon.

SOG Rules Retrieve the dossier and the defector from Hue City.

Down and Dirty Complete "SOG" and "The Defector" on Veteran difficulty.

Raining Pain Rack up a body count of 20 NVA using air support in Hue City.

The Dragon Within Kill 10 NVA with Dragon's Breath rounds.

Simply the Best Triumphed over other players to win 4 Throwdowns.
4/4

Trained Up Win 10 multiplayer games while playing in Combat Training playlists.

Looks don't count Break the siege in the battle of Khe Sanh.

Tough Economy Use no more than 6 TOW guided missiles to destroy the tanks in the defense of Khe Sanh.

A safer place Sabotage the Soviet space program.

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

VIP Receive orders from Lancer.

Give me liberty, or give me death Escape Vorkuta.

Sacrifice Ensure your squad escapes safely from Cuba.

Death to Dictators Take down Castro with a headshot.

Little Lost Girl In Origins, release Samantha.

Facing the Dragon In Die Rise, face the dragon head-on before reaching round 2.

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.

Party Animal Win 10 multiplayer games while playing in Party Games playlists.

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

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

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

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

Making the Dream Work Completed every Goal in 10 Co-op challenges.
10/10

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