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Finish Him? Perform any fighter's hidden finishing move

Communication Skills Endurance Co-op Challenge: Kill 5 enemies that have been marked by your partner

Twinsanity Defeat the Doctors N. Tropy

Campaign Gold Obtain all 108 medals on the original Arkham City campaigns (as Batman)

TLAD: The Lost Boy Become leader of The Lost. (The Lost and Damned)

Ride the Vortex Travel to a new reality using a Lumivista TV

Get Dizzy Yall Make Green Lantern dizzy 10 times.

Damp squib Hack a grenade before it explodes

Retro Survive the arcade game reality

I Felt Your Presence Witness the cult's meeting

Ascension Collect 2400 Essence and hear the Seer’s final words

Equipped an Elite Coil or Weave Equipped an elite coil on a weapon or an elite weave on an outfit.

Iron Will You faced your own demons and gave no ground to them.

Targets Acquired Defeat 20 enemies with Missile Pack.

Completionist Complete all Extinction challenges and escape in Regular or Hardcore difficulty.

Rare Weapons Expert: Praecisione Killed 20 enemies with a Praecisione

Arkham City Lockdown Defeat every Villain With Batman

Into the Sunset Salim returned home to his son

Throttled Escape Escape using a relic in Regular or Hardcore difficulty.

“Worlds of Hurt” – Expert Rescued the Little Sister in “Worlds of Hurt” in under 15:00, on Medium or higher difficulty

Lovers Quarrel Green Arrow must defeat Black Canary with the final hit coming from Target Practice

Do No Evil Defeat the One Who Waits.

Blessed Acquire all Charms and receive Salubra’s blessing

Top Of The Food Chain You successfully killed 20 players with a pistol in a deathmatch.

Aerial Dance Defeat 5th Colossus

Up to the Challenge 1 Complete 10 challenges.

Multiversal Agent Complete Episode 3: Time Breaker

Alone Time Endurance Co-op Challenge: Spend at least one day more than 60 meters apart

What Does This Button Do?? Complete Arcade Ladder without blocking (allowed to continue)

Might Makes Right Purchase all Attack upgrades.

Big Beat Down Defeat 20 enemies with Mech Suit.

Not a Poozer Gain experience level 10.

Perfect Knight - Day 2 Complete every challenge in Arkham City - Main Story, Side Missions, Upgrades, Collectables, New Game Plus and Riddler's Revenge (as Batman)

Gem Collector Collected 60,000 precious gems.

No Assistance Required! Completed a race without any assist settings.

No Longer Friends Cyborg must defeat Robin with the final hit coming from Apokolips

Biot Clear Mission 7.

Hot Pursuit Clear Mission 8.

Invincible Warrior Kill 50 enemies in a row with inventory weapons without losing health.

"Teamwork" Endurance Co-op Challenge: Collect an Artifact while your partner is down

Stay Down Knock an opponent into an Arena Transition 25 times

Dockyard Discord Finish the Connection level in "Joe's Adventures."

All New Machines Scanned Encountered and Focus scanned every new machine in the Burning Shores.
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Hang 'em High! Kill 30 enemies while they're suspended in the air with the grappling hook.

Toasty Charlie maintained control during dinner

Ultimate Weapon Clear Mission 9.

Faster Than Light Achieve a 10x point multiplayer in "Jimmy's Vendetta".

Not So Big Now, Are You?? Defeat A Mini Boss In Invasions

Pied Piper Entice 10 Stormtroopers to leap to their deaths with Mind Trick.

Get Away from Her! Endurance Co-op Challenge: Kill an enemy melee attacking your partner