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Come On And ... Slam 10 zombies at once in Outbreak.

Frozen Fists Complete Frosted Fjord without having a melee or ranged weapon equipped at any time.

Acidic Alchemy In IX, Get a kill with the Acid Trap in each of its craftable locations

I Know a Shortcut In Voyage of Despair, take every fast travel path in a single game

2-fer Using the EBR-14, kill 2 enemies with 1 bullet 5 times in 'Payload' without sounding the alarm

Elevator Out of Order Reach the roof in 'Highrise' under 45 seconds

A Prize Every Time Spend 5,000 Credits.

Nahantu Sightseer Explore all of Nahantu.
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Tournament of Destroyers Dominator Achieved victory in the Tournament of Destroyers.

The Changing Future Completed the "The Changing Future" chapter of Goku's Saga.

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

Guac is Extra Find Dave the Burrito.

Gravestone Kill 100 Zombies with a vehicle in a single deployment in MWZ

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

Bookwyrm This is proof that you've become quite familiar with the Library. How to obtain this is kind of a secret, but if you take the time to do a bit of reading now and then, you should be pleasantly surprised.

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

Donut Mess with a Cop Unlock Officer Dick.

A Little Pack Here, a Little Punch There In Voyage of Despair, use the Pack-a-Punch at every possible location in a single game

High Score In Zombie Rush, obtain a Personal Score of 250,000

Tournament of Power Top Dog Achieved victory in the Tournament of Power.

Going to the Vet Earn the "Veteran" Challenge Collection.
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Chatterbox Sometimes, after you've found a discovery point or when you're at a save point, you have the opportunity to press L3 to initiate a conversation between your companions. This is proof that you've experienced many Things and had a lot of Opinions about them.

State of the Badass Art Complete all Campaign levels on Ultimate Badass difficulty

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

Back in the Field Acquire the Major's keycard in 'Deep Cover' within 90 seconds without being detected

Get him! Win a Quick Race on a track in the Batcave (not unlockable in Split Screen).

The Road to Glory Win every battle on Victory Road.

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

Alright, Alright Survive until round 10 in Infection.

Repeat Customer Save yourself by using the Death Barter enchantment twice in a single mission.

J-Adventure Maestro Clear all story arcs in J-Adventure mode.

Pushing the Limit Completed the "Pushing the Limit" chapter of Goku's Saga.

Folk Hero Complete all quests in the world in Story mode
80/100

Complete Episode 3 Complete all the chapters in Episode 3.

Survivor Survive until Round 25 in Outbreak.

Nightwing Revenge Obtain 78 medals on the original Arkham City and Nightwing Bundle Pack ranked maps (as Nightwing)

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

PC Load Letter Use the 3D printer 15 times in a single match in Outbreak.

Robin Revenge Obtain 78 medals on the original Arkham City and Robin Bundle Pack ranked maps (as Robin)

You Can Pet The Dog Pet a Hellhound in MWZ

GIR Collector Hit all greens in regulation in an 18 hole round on an official course.

The Ultimate Sacrifice In Zetsubou No Shima, retrieve the Skull of Nan Sapwe.

Thank You Watch the credits all the way through the end.

Heavy Ordinance Specialist Destroy 50 Aerial Scorestreaks with Launchers in Multiplayer

Pink Progress Breed 50 pigs

Call me Terror-Billy! Beat the game on "Call me Terror-Billy!" difficulty or higher

Rules of Etiquette Reach the top of the throne in the Demon King Castle.

Multiplicitous In Zombie Rush, get your score multiplier up to 100

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

Lost In The Snow Complete the Lost Settlement secret mission.