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Master Ninja Complete any level using only the knife to kill enemies.

Roped In Perform 5 air assassinations from a swinging rope.

Hide And Seek A deadly game of hide and seek

Bird on the Ground Shoot down an enemy helicopter with an RPG in the single player campaign.

Liberator Complete all Outcast Rescue Missions.

The Bog Complete 'The Bog' and 'War Pig' on Veteran difficulty.

Cartographer Visit every location of the game.

Soothing Sounds Use the music player for the first time.

The First Horseman Complete 'Shock and Awe' on Veteran difficulty.

Chatterbox Complete all conversations with the Endurance crew.

Desert Storm Find the Desert Eagle in 'Crew Expendable' and kill 5 enemies with it.

Master of the Wilds Complete all Hunting Challenges.

Sharing Is Caring Share each type of discovery with friends once.

Ghost Train Fight for survival

IQ Test Solve the first riddle

The Second Horseman Complete 'Safehouse' on Veteran difficulty.

Master Blaster Kill 2 multiplayer enemies with a single explosive.

Arkham City Sirens Drop in on an old friend

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

Sea Legs Complete all naval contracts.

Rise and Fall After an uruk kills you to become a Captain, help him become a Warchief, then kill him.

Freefall Don't look down

Lightning Rod Defeat Steropes the Lightning Bringer.

Time Paradox Kill Makarov and complete your mission

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

Exit Stage Right All the world is a stage

Are you ready now? Talk to Squidward 10 times as SpongeBob.

The Man in the High Tower Find and use the hidden cache in 'Heat'.

Burning Vengeance Perform an Execution on a flaming Berserker.

No Power in Numbers Help a Captain survive a Recruitment Power Struggle, and then kill him and all his new recruits.

Dogs. I Hate Dogs. Kill 20 attack dogs with a knife.

Stinking Rebels Brand 5 Bodyguards of a Warchief, turning them against him in combat.

Man versus Machine Alert the enemy helicopter in 'All Ghillied Up' and take it down.

Your Show Sucks Destroy all the TVs showing Al-Asad's speech.

Cannon fodder Recruit 500 crew members.

Artilleryman Kill 20 enemy players in multiplayer using a turret.

Snap + Slide 8 Piece Prize Complete a Snap + Slide puzzle with 8 pieces in 30 seconds or under.

The Shot Complete 'All Ghillied Up' and 'One Shot, One Kill' on Veteran difficulty.

A Thirst for Knowledge Restore your first memory chip.

Flyswatter Destroy 8 enemy helicopters in 'Heat'.

The White Rider Liberate 30 slaves in 180 seconds while riding a caragor.

Eyes and Ears Find 30 enemy intel items.

The Third Horseman Complete 'Heat' and 'The Sins of the Father' on Veteran difficulty.

The Fourth Horseman Complete 'Game Over' on Veteran difficulty.

Siren Song Rescue pirate hostages by distracting enemies with "dancers."

Deep and Hard Complete the game on Hardened or Veteran difficulty.

A Mighty Doom Acquire a level 25 Rune.

The Ultimatum Complete 'Ultimatum', 'All In', and 'No Fighting in the War Room' on Veteran difficulty.

Stop the Clock Time is running out

Conundrum Rescue the first hostage from Riddler