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

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

Press The Serpent Expose the flaws in the code.

Yeeee HAW! Complete the Adventure Mode on the Hard difficulty.

Changed My Mind. It is never too late to accept Elohim's forgiveness.

Freelance, but Not For Free Complete 80 contracts.
22/80

Grassroots Campaigner Complete all side missions.
44/98

Silence The Serpent Do not allow the serpent to fill you with doubt.

A Good Listener Listen to all she has to say.

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

Finders Keepers Picked up 100 game pieces.

Specter Officer Reach max level with one class in the Cooperative campaign.

Duet Play an instrument next to another player, who's playing a different instrument

Z-Genocider 2: Genocide Harder Kill 53,596 zombies

A Hippo to Go As Shelly, sprinted away from a hippo as it chased you.

Top Dog (Online) Got highest score on the score screen at the end of the game.

Ravenous Stud Collector Collect 60,000+ studs in a single streak (no more than a 2 second gap between each stud collected)

Took this thing on a test flight Complete Arcade mode with a custom made ship, at Veteran difficulty level

Perfect 10 Pigsy's Perfect 10: Finish the Shooting Gallery under 40 seconds without shooting any pin-ups.

Backwards & Forwards Complete ALL levels in N. Verted mode

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

Four Birds, One Stone Pigsy's Perfect 10: Kill 4 Mechs with 1 Bomb device.

Rank - Adventurer Builder! Collect 50 Gold Bricks

Deal With The Deceiver Strike a deal.

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

Disco Hits As Ruby, stunned 100 enemies with your Boombox.

Death of Comedy Use every type of novelty weapon on a zombie

Dark, Dank and Dangerous Find a Dungeon

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

Take It With You Internalise the voice of doubt.

Blessed Messenger Solve every mystery in every land, that you might aid those who walk in your footsteps.

Green Energy Produce all electricity without using raw materials.

Blood Bank Kill 10,000 enemies

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

Between a Rock and Hard Place As Smolder, took down 100 enemies with your Ground Pound.

Stunning! Pigsy's Perfect 10: Stun 5 enemies using one single EMP device.

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

All Star Get 100 Stars in S.T.A.R. Lab Mode

Around and Around We Go Perform every level interaction once

BADGER! Ride a Badger

Lone Wolf (Online) Was the only surviving player in the team.

The New Time-Master Beat all of Nefarious Tropy's times in Time Trial Mode.

Is everyone here? Unlock all characters from the original roster.

Tomb Raider Collect all relics, artifacts and weapons

To Me, To You Passed the Jewel 100 times.

Unpopular Mayor Have 15% happiness

Thorough Researcher Collect all pieces of written information.

Campaign Kitty Obtain all 108 medals on the original Arkham City campaigns (as Catwoman)

Retribution Dealt with the mercenaries that killed the Vael family. ("The Exiled Prince" downloadable content)

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