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Army of 24 Rescue 24 Bee Team guards

Pursuit of Knowledge Filled 80% of the Datalog.

I Used to Be a Human Like You Shoot a Walker in the Knee with a Bolt

Math is Hard Achieve Rank 101.

Electric Whisper Learn how to craft Electric Arrows

Let's Play Complete the first Horde Mode Mission

Brainiac Unlock all trophies.

Army of 26 Rescue 26 Bee Team guards

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

Still Not Buying a Hybrid Consume 250 Fuel

Sub Zero Complete the "Arctic Recon" Special Ops mission on Veteran difficulty.

You Snooze, You Lose Sneak up on The End and hold him up to make him drop an item

Nemesis Meet Skullface

You're a big T.W.I.T. Collector Get 100 T.W.I.T. Coin

Army of 28 Rescue 28 Bee Team guards

Plyusch Rush Kill Plyusch

Mmm, sausages Whoa, you unlocked a secret area!

Army of 30 Rescue 30 Bee Team guards

Army of 32 Rescue 32 Bee Team guards

I've Got This Acquire all upgrades

Discriminating Buyer Use exactly one of each care package in the "Special Delivery" Special Ops mission.

Army of 34 Rescue 34 Bee Team guards

This Is How Hot Dogs Are Made 10 Walkers Killed with Saw Blades in the Logging Camp

Quite an Achievement Clear the VDNH complex

In A World Without Gold Witness the end of a legend (complete Sequence 8, Memory 1)

Give Them Something to Believe Complete New Game Plus

Lights Out Complete the "Light 'Em Up" Special Ops mission on Veteran difficulty.

Army of 36 Rescue 36 Bee Team guards

Just Like Old Times Dispatch the professor with a shot to the groin.

Gun-kata Use pistols to kill four enemies in a row within five seconds

A Good Man Is Hard to Find Achieve a Camo Index of 100%

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

Army of 38 Rescue 38 Bee Team guards

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

Donut Mess with a Cop Unlock Officer Dick.

Army of 40 Rescue 40 Bee Team guards

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

Going to the Vet Earn the "Veteran" Challenge Collection.
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Lefthand Mastery Fully upgrade one skill tree

Army of 42 Rescue 42 Bee Team guards

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

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.

PEACE WALKER Clear the game without killing anyone

They're People, Too! Complete a Marked Destination on the Map without Killing a Walker

Wax On, Wax Off Parry all of The Boss's CQC attacks

Have a Nice Trip! Kill a Walker That Is Falling Due to Dismemberment

Four play-tonics Beat a level with four play-tonics equipped

Let Me Explain After a perfect parry, perform a total of four takedowns

Army of 44 Rescue 44 Bee Team guards