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Bombardier Collect the formulae for 6 different bomb types.

Chatterbox Complete all conversations with the Endurance crew.

Get Off My Cloud Get 100 High Fall take downs.

Industrial Accident In the Main Campaign, killed 20 enemies with a Sky-Hook Execution.

Chose Afterlife Entered the Infraworld.

Tonic Collector Collect or Invent 58 Tonics in the Physical, Engineering and Combat tracks

Found Cohen's Room The player has entered Sander Cohen's personal quarters

High Flier Kill 5 duskbats without touching the ground
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Arkham City Sirens Drop in on an old friend

Master Blaster Kill 2 multiplayer enemies with a single explosive.

Down Boy! Kill a zip-lining enemy player in multiplayer.

Casual Girl Ordered a pizza, watched some TV and wore something casual.

Research PhD Max out all possible research

Monkey Around In multiplayer, escape death 3 times by using the rope ascender.

Casey Jones Take down 25 enemies while riding on a moving train.

Avid Inventor Successfully invent at least 100 items

More for Your Money In the Main Campaign, lured 3 enemies into a single Vigor trap 5 times.

Environmentally Unfriendly Kill 50 opponents using the environment (e.g. swamp gas, insects or objects).

In Love with Ryan Slept with Ryan.

Tae Kwon Leap Kill 25 zombies with your bare fists.

Evil to the Core Purchase every negative Karma upgrade for each power.

Artilleryman Kill 20 enemy players in multiplayer using a turret.

Hazard Pay In the Main Campaign, killed 10 enemies by utilizing environmental hazards.

Weapon Specialist Acquire all upgrades for all weapons

Houdini Got arrested three times and escaped each time.

Aiden's Apocalypse Destroyed the gas station, the church, the gun store and the helicopter.

I'm all that! Win a ranked match in every multiplayer mode.

Open Air Parking Destroy a helicopter during the apocalypse with a vehicle

Something More Find Ciri.

Kingmaker Complete the subplot about choosing Skellige's ruler.

Bolt From the Blue In the Main Campaign, killed 5 enemies with a headshot while riding a Sky-Line.

Mutant Fill all mutagen slots.

Saved All Saved every character that could be saved.

Strange Bedfellows In the Main Campaign, killed 20 enemies using allies brought in through a Tear.

Even Odds Kill 2 monsters you have a contract on without using Signs, potions, mutagens, oils or bombs.

Xenonaut Visit Tir ná Lia and convince Ge'els to betray Eredin.

Fearless Vampire Slayer Complete the contract on Sarasti.

Passed the Trial Finish the game on any difficulty.

The King is Dead Defeat Eredin.

Supernatural Born Killers Defeat 5 Descendants With a Sniper Rifle

Flawless Freeflow Fighter Complete one combat challenge without taking damage

Ashes to Ashes Complete the contract on Therazane.

Stunt Master Complete all of the stunts on the stunt list.

Together Till the End Finished the game in Duo mode.

To put it bluntly Kill 250 zombies using blunt melee weapons.

Munchkin Reach character development level 35.

Historian Find every audio diary

Locked and Loaded Upgrade each available component for a single sidearm or longarm weapon.

Skeet Shoot In the Main Campaign, killed 5 enemies while they are falling.

Brawler Defeat Olaf, the Skellige champion of unarmed combat.