FadeToOne

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

Pit Master Discover and fight Hidden Kombatant 3 in Arcade Ladder

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

Worst Nightmare Master the Worst Nightmare Dark Knight track

Mighty Wander Max out stamina bar

Paladin Obtain great power

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

Hard Headed Collect 1000 helmets

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

Let it Snow Receive the Extreme Environment Suit (XE Suit)

Insert Coin Complete all achievements in one game from The Arcade.

Muppet Mastery Complete The Muppet pack's story

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

The Chaos In the Rift Encountered a chaos event.

Trinket Collector Collect all rings and pendants.
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Bleeding Knuckles Reach a lifetime score of 5,000,000.

Clean Sweep Complete the System Rift Jensen Story without killing anyone.

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

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

Enough Coin to Disappear You survived The Brigmore Witches in low chaos with 10,000 coins

Monster Summoner Summoned your first monster.

King in the North Complete all Final Stand Assignments

Drilling for Justice Assemble the cryonucleation tunneller - the cryodrill

Spirited Sparring Kill 500 enemies with Ultimate Skills as a Spiritborn.
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It's a Trap! In Shi No Numa, kill at least one zombie with three different traps in a single round.

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

A Just Cause Decide what to do with the Altered Biocell.

"Knock, knock" Peek under 10 doors.

As A Scalpel Earn the "Excellent" rating in every performance category on a terror mission.

Ranger Obtain an A-Rank or Higher on all bosses in Inkwell Isle IV

Sky Runner Unlock Titan Sky

Murder He Wrote Find all pieces of evidence behind the Saridakis murder.

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

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

I am death incarnate! Beat the game on "I am death incarnate!" difficulty or higher

Welcome to The War Play and complete your first Ranked Match in standard Deathmatch mode

No More Mr. Nice Guy You pissed off everyone in Venezuela

Cornucopia Acquired all fruits in the world

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

Practical Mayhem Deploy an active skill in a mission, and have at least one other player use the results.

Too Hot to Handle Complete the server chamber area without being detected by any HeatEye cameras or enemies.

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

Stalact-tactician Takedown 2 enemies with one stalactite

Balancing Act Balance another sackperson on an object while lifting it with touch.

Crusade - Chapter XIII Finish the levels from Chapter XIII in Knight difficulty

Extermination Expert Play 5 public matches of Extermination

For Auld Lang Syne Stop Freeze and bring Boyle to justice

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

Game Over Beat Horde Mode

Legend of the Dark Knight Complete all Dark Knight challenges