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That Old Adage Apparently, your CASIE augmentation doesn't work on everyone...

Ninja Perform 3 kill moves in a row. (Single Player)

Never Forget You revisited the site where Belltower discovered and captured you.

Cleanest Hands You completed The Brigmore Witches without killing anyone

Spliced Complete the "Wrath of the Machine" raid.

Not the face Smash an enemy's face into a wall. (Single Player)

SNAFU Complete SNAFU.

Spin Doctor Kill two enemies with one throw of the Battle Disc

Deforestation Kill 15 Seeder Turrets in one game in Mayday in Regular or Hardcore difficulty.

Over the top Throw an enemy over a ledge. (Single Player)

Egg-stra XP! Complete the Egg-Stra XP challenge and then destroy a hive in the Onslaught DLC package.

Fertilizer Man Kill 200 zombies in a single game. (Map Pack 2 only)

Big Brawler Get 10 consecutive zombie melee kills before Insta-Kill expires. (Map Pack 2 only)

Silence is Golden You completed The Brigmore Witches without alerting anyone

Perk-a-Holic Have all four perks simultaneously active in a game of Nazi Zombies. (Map Pack 2 only)

Pea Shooter Kill a Rhino with only a pistol in Nightfall in Regular or Hardcore difficulty.

40 Knives! Kill 40 zombies with the bowie knife. (Map Pack 3 only)

Factory Zero You survived Hei Zhen Zhu and RBS using no Praxis kits, weapons, grenades or mines. Whoa.

Perkaholics Anonymous! Survive until round 20 without buying a single Perk. (Map Pack 3 only)

Frequent Flyer! Use the teleporter 8 times. (Map Pack 3 only)

Soul Survivor Reach round 15 in Nazi Zombies without getting revived. (Map Pack 2 only)

KISS Complete KISS.

Now THIS is a Knife Kill 30 enemies using kill moves. (Single Player)

Speed Slayer Kill the Breeder in less than 5 minutes in Nightfall in Regular or Hardcore difficulty.

Throttled Survival Kill the Breeder while using a Relic in Nightfall in Regular or Hardcore difficulty.

Survived Mayday Kill the Kraken for the first time in Mayday in Regular or Hardcore difficulty.

Pack Addict! Upgrade 5 weapons at the Pack A Punch Machine. (Map Pack 3 only)

Targets Acquired Get past the first gate in Awakening in Regular or Hardcore difficulty.

GNBN Complete GNBN.

Postmaster Complete any outpost by activating all of the generators in Regular or Hardcore difficulty.

Big Game Trapper Use a hypno trap to turn a Rhino friendly in Mayday in Regular or Hardcore difficulty.

Undiscovered Truths Find all the intel hidden in Nightfall.

Migraine Breaker Kill 50 enemies with head shots. (Single Player)

PFDL Complete PFDL.

Acquire Waffle Weapons! Obtain the Ray Gun, DG-2, and the Monkey Bomb at the same time in a game. (Map Pack 3 only)

Egg-stra Devastation! Complete the Egg-Stra XP challenge and then destroy a hive in the Devastation DLC package.

FUBAR Complete FUBAR.

Frag Out! Kill 20 enemies using grenades. (Single Player)

A Bridge To Somewhere Extend the bridge in Awakening in Regular or Hardcore difficulty.

Deadhead Get 150 zombie headshots in a single game. (Map Pack 2 only)

HUMINT Complete HUMINT.

Warpath Get the rampage bonus up to 5 sequential kills

It's a Trap! Kill at least one zombie with three different traps in a single round. (Map Pack 2 only)

Are These Guys For Real? Kill 50 Spetznaz. (Single Player)

KATN Complete KATN.

Escaped Awakening Escape Awakening for the first time in Regular or Hardcore difficulty.

DOY Complete DOY.

Egg-stra Awakening! Complete the Egg-Stra XP challenge and then scan an obelisk in the Invasion DLC package.

Nightfall Completionist Complete all challenges and kill the Breeder in Nightfall in Regular or Hardcore difficulty.

Turnabout is Fair Play Kill 50 Cryptids with the Venom-X weapon in Nightfall in Regular or Hardcore difficulty.