SiZeR-

High Roller Complete the "Iron Clad" Special Ops mission on Veteran difficulty.

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

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

Feeding Time Feed the Narwhal.

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

Icebreaker Equip the Icebreaker.

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

Under The Ice Finish the main quest in The Pale Reach.

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

Deer in the Headlights Stab five stunned enemies in a row in the "Light 'Em Up" Special Ops mission.

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

Fresh Fish Have 5 ice blocks in your cargo.

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

From The Black Depths Catch the Colossal Squid.

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.

Frozen Favors Finish all side quests in The Pale Reach.

Polar Angler Catch all known species of fish in The Pale Reach.

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

Sub Zero Complete the "Arctic Recon" Special Ops mission on Veteran difficulty.

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

Gest - Chapter XIII Finish the levels from Chapter XIII in Warrior difficulty

I Got This In The Darkest Shore, survive the initial beach rush without using any machine gun turrets.

Cold Corruptions Catch all aberrations in The Pale Reach.

Undiscovered Truths Find all the intel hidden in Nightfall.

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

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

Discriminating Buyer Use exactly one of each care package in the "Special Delivery" Special Ops mission.

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

Lights Out Complete the "Light 'Em Up" Special Ops mission on Veteran difficulty.

Master of the reliquary Gather all the fingers of Frankenstein

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

Deliver This Complete the "Special Delivery" Special Ops mission on Veteran difficulty.

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

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

Flyswatter Destroy all helicopters in the "Vertigo" Special Ops mission.

Skirmish - Chapter XIV Finish the levels from Chapter XIV in Squire difficulty

Pinnacle Complete the "Vertigo" Special Ops mission on Veteran difficulty.

To Jugger or to Jugger-Naut Kill all juggernauts after they land on Veteran difficulty in the "Vertigo" Special Ops mission.

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

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

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

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.

Going Up… In The Darkest Shore, unlock the Ubersprengen.

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

Upping the Ante Kill the Kraken using a Relic in Mayday in Regular or Hardcore difficulty.

Need a sentry here! Unlock the Mechanic form

Hat Trick Kill 3 aliens with a single shot from the NX-1 Disruptor in Regular or Hardcore difficulty.

Dog Fight Kill a Gargoyle with the Vanguard in Awakening in Regular or Hardcore difficulty.