Athenacas

From The Black Depths Catch the Colossal Squid.

Street Fighter Complete all Dragon's Teeth Assignments

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

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)

Survivor Survive until Round 25 in Outbreak.

Good Listener Found 20 Portable Phonographs.
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Robin Revenge Obtain 78 medals on the original Arkham City and Robin Bundle Pack ranked maps (as Robin)

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

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

Frozen Favors Finish all side quests in The Pale Reach.

You Can Pet The Dog Pet a Hellhound in MWZ

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

Heavy Ordinance Specialist Destroy 50 Aerial Scorestreaks with Launchers in Multiplayer

Untouchable Complete SAM'S STORY on Normal or higher difficulty without dying in Batwing encounters.

Sack the Postman Post all 6 invitations for the party.

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

Cold Corruptions Catch all aberrations in The Pale Reach.

High Wire Act Kill 10 enemies while using a zipline

Annihilation Get 100 Elite Zombie Eliminations in Zombies

The Postman Delivered the journal to Lucien.

Muppet Mastery Complete The Muppet pack's story

No Mo' Modi Get out of jail, but not for free

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

That's One Way to Do It... Destroy an airborne enemy helicopter with a Mortar Strike

1-Upsmanship Complete Extra Life Mode with 5 Extra Lives in your Inventory (Ancient Gods 1)

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

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

Perkaholic Have 9 perks active at the same time in MWZ

Controlled Chaos In Revelations, override all of the Corruption Engines before round 6.

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

King in the North Complete all Final Stand Assignments

Campaign Nightwing Obtain 114 medals on the original Arkham City and Nightwing Bundle Pack campaigns (as Nightwing)

Campaign Wonder Obtain 114 medals on the original Arkham City and Robin Bundle Pack campaigns (as Robin)

It's a Trap! In Shi No Numa, kill at least one zombie with three different traps in a single round.

Reinvent the Weapon Wheel Re-collect all of the weapons on the Weapon Wheel

Not One Inch In Gorod Krovi, complete a Lockdown Event.

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

Big Top! Achieve a score of 2500 or higher in "Gonzo's Endless Cannon Run Ride!"

The Stick of Truth Equip a Legendary Bo (Claws of Awaji)

Dipped in Gold Purchase all Safehouse and Player Upgrades in Campaign

The circle is now complete Get to Rank 100

141 Ready Complete the campaign on Veteran

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

Relics of the Old Faith Collect all Relics.

Cyberized Research all Augments for 10 Items in Zombies

Live Die Reload Complete Extra Life Mode with 5 Extra Lives in your Inventory (Ancient Gods 2)

Mass Exodus Complete the final Ancestor encounter in Regular or Hardcore difficulty.