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Gladiator school Survive 15 consecutive waves with each of the 4 characters.

Group Effort Reach rank 25 in any faction

Taboos should be Challenged Used a Black Rite.

Ignore Your Instincts At Your Peril Destroy 25 objectives in Starfighter Assault.

Mr. Green Thumb Fully upgraded the Grow House

Tripped and Fell Defeat Boss Timid Swimmer

Eureka Crack the Jindosh Lock without finding the solution elsewhere

King of Wakanda Complete the 'Classic Black Panther' level after achieving True Avenger status

For the Night is Dark Endurance Co-op Challenge: Clear 3 Enemy Camps at night in a single expedition

A Sticky Situation Complete the 'The Masters of Evil' level

Talion A.D. Descend into the bowels of an urban jungle and confront a warrior-priest.

Fustercluck Off Complete all side missions and crew challenges in Krieg's Mind.
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This madness ends now! Complete ''Mask of the Phantasm''

I Felt Your Presence Witness the cult's meeting

Twelve Feet Under Complete Act 5 - Chapter 1 on any difficulty setting

Teamwork Endurance Co-op Challenge: Warm up from freezing by standing next to a campfire lit by your partner

Wendigo Fissure Finish the Wendigo Fissure without losing your Stamp

Every bullet counts Get a 5-for-1 kill with any sniper rifle

Materia Maven Obtain all materia available from Shinra Box Buster challenges.

Found Kunoichi Find and free Kunoichi

Presentation of a Rich Set of Skills In solo play, complete a level without firing your weapons once

Going Strong Reach Rank 50

Hunting Season Vanquish 100 Soldiers, 100 Scientists, 100 Engineers and 100 All-Stars

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

Lost and Found Retrieve all five missing ninja

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

Regal Completely upgrade one throne.

The Flawed Couple Defeat General Horse.

Stunt Flyer Fly an airplane close to the ground for 30 seconds.

Judge me by my size, do you? Reach Rank 25

Billy Batson, I chose you as champion Complete ''Sivana Escape''

The Enemy Within Complete the 'Classic Captain Marvel' level

Eregion Reforged Build all the Forge Towers in Udun.

Crash Landing Defeat Boss Screeching Owl

EXTRA: Chaos Rosalia Find the Chaos Rosalia in Astral Stair.

Become that which you fought against Complete ''Mask of the Phantasm'' after achieving True Villain status

Don't call them sidekicks Complete ''The Summit''

Trick Arrow Skills Shoot a Lizard with a Special Arrow

Pacifist Clear the "Intel Operative Rescue" Side Op without killing a single enemy

Celestial Selfie Take a selfie with Eson the Searcher in ''No Eson of Mine''

EXTRA: Trisection Find the Trisection in Astral Stair.

Ye Who Enter Open the gates to Vaulthalla.

Carol Corps Candidate Complete the 'Classic Captain Marvel' level after achieving True Avenger status

Phasmophobia Defeat the boss in the Forest Abkhazia.

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

Worthy of a True Zemo Complete the 'The Masters of Evil' level after achieving True Avenger status

...Where Credit is Due Watch the credits from beginning to end.
"Hey...aren't they the guys who made Dead Head Fred?"

The Castle of Hussle Complete Act 5 - Chapter 2 on any difficulty setting

Weed Whacker Vanquish 100 Peashooters, 100 Sunflowers, 100 Chompers and 100 Cacti

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)