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Soothing Sounds Use the music player for the first time.

Giver of Gifts Make your first donation of weapons, equipment, etc.

Chatterbox Complete all conversations with the Endurance crew.

Crack The E Nigma Solve every riddle on the island

Arch Villain Earn full negative Karma.

The Cleaner Complete the assassination side missions.

Speedy McSpeederton Raced around the Ludicrous Speedway in record time

Petrol Head Drive at least thirty different vehicles.

Officer of the month Score "A" on any evaluation.

Fully Loaded Rescued enough Claptraps to earn 42 inventory slots

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

World's Greatest Detective Spirit of Amadeus Arkham revealed

Hard Boiled Help officers Kurtz and O'Neal solve a murder case.

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

Look Out Below Completed Episode 12.

IQ Test Solve the first riddle

Kids Just Don't Understand Completed Episode 13.

With Great Power Comes Greater Power Unlock and purchase all powers.

Everyday Delivery Complete a standard order.

Arkham City Sirens Drop in on an old friend

No stone unturned Find a secret area in the Arcade.

Dead-On Score 150 points at the shooting range.

Master Blaster Kill 2 multiplayer enemies with a single explosive.

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

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

Sea Legs Complete all naval contracts.

Freefall Don't look down

The Lost Tribe Completed Episode 14.

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

Tough Nut Finish the story on hard difficulty level.

Wasteland of Opportunities Complete Act 02

Memories of Another World Completed Episode 15.

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

Exit Stage Right All the world is a stage

Children of the Past Completed Episode 16.

Stuck Up Rob five stores in under five minutes.

Doing Gutgash a Big Favor Build two projects in Gutgash's Stronghold

Research PhD Max out all possible research

Don’t Go - Easy Finish Left Behind on Easy

Fading Light Completed Episode 17.

Ding! Champion Earned level 50

Practice Makes Perfect Fully develop any skill.

Brick Master Win the brick throwing contest

Cruise Control Keep any vehicle at thirty mph or over for five more minutes.

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

The Skilled Driver Complete a Barrel Bash Death Run

Avid Inventor Successfully invent at least 100 items

Exporter Sell five vehicles to Derek at the dock.

Cannon fodder Recruit 500 crew members.

Pain Builds Character Finish the game on hard difficulty.