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Breathing Room Kill a Viper who is strangling a squadmate

The third faction Rescue all the Buddies from their respective predicaments

Last Blood At the end of Guns of Stygia, kill all the enemies on the walkways before the explosions do

Daemonologist All Charms unlocked

The First Harmonic Score your first harmonic in Needle Hills.

Smell You Later The punks are spooked and refuse to help you in your final quest

Up Up! Leap of Faith In the Closet

Get'em George Learn to standup for yourself

Get Personal Complete all agent personal missions and get all agents to level 20.

Egg-stra Devastation! Complete the Egg-Stra XP challenge and then destroy a hive in the Devastation DLC package.

Oh Yeah!!! Complete Nothing is as it Seems

Pack Addict! Upgrade 5 weapons at the Pack A Punch Machine. (Map Pack 3 only)

Dedicated Knight Complete 200 Event Quests.

Team Player Equipped 2 Team Charms

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

Falcon and the Snowman Complete Crime and Punishment in Single Player.

Two for One Complete Crime and Punishment in Multiplayer.

Top Of The World How far can you see

Room to Grow Upgrade a facility

Bookwyrm This is proof that you've become quite familiar with the Library. How to obtain this is kind of a secret, but if you take the time to do a bit of reading now and then, you should be pleasantly surprised.

Secret Mission 6 Use Raven's Serpent arte to set a trap for the Gigalarva and prevent it from healing itself.

Heroic Training Completed training with Goku!

A Star is Born Earn a bronze star in Career mode

You Won't Be Needing It Anyway Steal a Plane Weapon or Plane Mod from an enemy plane.

It's a Cover, Not a Hat Collect 20 hats on a single character.
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Perfect Date Finish a level without taking damage.

Love and botany Be in a relationship with Aphra

Secret Mission 4 Lure Zagi to the side of the ship and knock him overboard to cool him off!

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

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

Scattered and Tattered Receive the Scatter Gun Mod.

The Spice of Life Use three different types of Yamato weapons in a boss fight.

Bogey (1 Over Par) Take the alternate route above the cave

Prime Directive Shatter Skeletron Prime.

Appease the Volcano Gods An NPC is destined to die in a trial by fire.

Donut Mess with a Cop Unlock Officer Dick.

Green Series clear Get a silver medal on every green track

Determined Don't use any hints to finish the game.

Cat's nine lives Gain 9 Extra Lives

It's Camouflage on Some Planet Collect 40 weapon colors on a single character.
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Robin Revenge Obtain 78 medals on the original Arkham City and Robin Bundle Pack ranked maps (as Robin)

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

Gasmoxian Slug Beat all of Nitros Oxide's times in Time Trial Mode.

Not a Cat Person? Jess resents you and refuses to help you in your final quest

A Bridge To Somewhere Extend the bridge in Awakening in Regular or Hardcore difficulty.

Chatterbox Sometimes, after you've found a discovery point or when you're at a save point, you have the opportunity to press L3 to initiate a conversation between your companions. This is proof that you've experienced many Things and had a lot of Opinions about them.

Entrapment Kill 20 enemies with security guns in a single level.

Closing the Experiment Log Earn ALL of the platinum Flashback Relics

Up-Lifting On Monorail Factory, kill all enemies whilst riding the lift

Rising Star Earn a silver star in Career mode