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Make Them Count Kill 100 enemies with headshots.
100/100

The Autumn Leaves Complete Pillar of Autumn.

Mad Without Power In Die Rise, reach round 10 before turning on the power.

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

Shifting Sands Gather intel on Raul Menendez from Mullah Rahmaan.

Gathering Storm Investigate the jungle facility.

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.

You Have No Power Over Me In TranZit, defeat "him" without being attacked by "him".

Don't Fire Until You See In TranZit, have all doors opened without being set on fire.

Standard Equipment May Vary In TranZit, acquire 4 different equippable items in 1 game.

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

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

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

Master Wizard In Origins, wield all of the ultimate staffs in one game.

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

Awaken the Gazebo In Buried, Pack-a-Punch a weapon during round 1 with no one using the bank or Weapon Locker.

Sorry About the Mess Complete the Mos Eisley Cantina job.

What a Desolate Place This Is Complete the Lars Homestead Job.

Great Shot Kid, That Was One in a Million! In the Lars Homestead job, spray Luke’s T-16 Skyhopper while standing on the EG-6 Power Droid.

Blinded By the Fright In Shangri-La, kill a Shrieker zombie while blinded by it.

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

Perks in Spaaaaace! In Moon, purchase every perk in one game.

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

Fully Armed and Operational In Moon, acquire 3 pack-a-punched weapons at the same time.

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

Full Lockdown In Mob of the Dead, Brutus completes his patrol.

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.

Trapped in Time In Mob of the Dead, use and upgrade all traps before round 10.

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

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

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

Chimp on the barbie In Ascension, kill a space monkey with a fire trap.

Double Trouble Use only dual wield weapons to escape Kowloon.

Stand Down Complete the campaign on any difficulty.

BLACK OP MASTER Complete the campaign on Hardened or Veteran difficulty.

Burn Notice Complete "Rebirth" and "Redemption" on Veteran difficulty.

Clarity Crack the code.

I hate monkeys Kill 7 monkeys in under 10 seconds in the Rebirth labs.

Not Today Complete "Crash Site," "WMD," and "Payback" on Veteran difficulty.

Never get off the boat Find the Soviet connection in Laos.

It's your funeral Complete "Numbers," "Project Nova," and "Victor Charlie" on Veteran difficulty.

Up close and personal Silently take out 3 VC.

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

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