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Two's Company, Four's a Party Complete any Adventure level with 4 players.

Undiscovered Truths Find all the intel hidden in Nightfall.

Burgertown Escort Service Rescue 1 survivor in Infection.

He knows what they did last era Found all eight audio notes in the Ancient Labyrinth

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

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

I kill dead people Killed 40 ghosts in the Ancient Labyrinth

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

Hope and Despair Completed the additional mission: "Ebon Memories: Hope Within Despair."

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

Tag, You're it! Use the Spotter Scope to tag 60 enemies or items in Open Combat Missions

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

You're Not Worthy As My Opponent Breach: Send 3 Challenges.

Break a Leg Fend off a menace from above in Mission 05 as Nero, Dante, or V.
0/1

Light in the Darkness Clear Mission 08 as Nero, Dante, or V.
0/3

The third faction Rescue all the Buddies from their respective predicaments

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

Tourist, Shivering Isles Entered the Shivering Isles

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

Medal Master Obtain 3,000 or more medals in Flick Rush.

Don't make me pull the trigger! Survive for 5 minutes in Demolition mode

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

Mountain legend Complete 30 MOUNTAIN STORIES in Alps

Favorite Clear all missions of any rank consecutively using the same gun parts.

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

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

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

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

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

Making mountains out of molehills Kill 100,000 enemies.

Street Fighter Complete all Dragon's Teeth Assignments

Untouchable Emissary Reach the end of the game without a game over.

That Party was Ace Ace every Adventure level in The Journey Home.

ARCHIVIST Collect all documents

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

Alright, Alright Survive until round 10 in Infection.

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

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

Don't burn yourself out Defeated the Keeper

Survivor Survive until Round 25 in Outbreak.

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

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.

Zoologist Control the ram and feed your opponent to the alligator

Finale Unlocked the Ending Movie

Tailor-made Chose a perfectly fitting armor

Golden Idol Perform every Single Player Skillshot in the game

You Can Pet The Dog Pet a Hellhound in MWZ

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