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Murder Mill Collected all Murder Mill artifacts.
2/10

Engineer Unlocked a certain number of Radio Towers.
19/24

Snow Angel Execute the forest sniper in 'Frozen Tundra' with a takedown

Rapid Reflexes Get 5 Headshot Kills during a single use of the Adrenaline Stim in Campaign

Hitchhiker Defuse the bomb on the truck in 'Gora Dam' while it is in motion

Campaign Kitty Obtain all 108 medals on the original Arkham City campaigns (as Catwoman)

Let's Play Complete the first Horde Mode Mission

Dark Room Beat the Dark Room

Capital Punishment Completed the game on the hard game difficulty setting, any ending.

Throttled Survival Kill the Breeder while using a Relic in Nightfall in Regular or Hardcore difficulty.

Developmental Graduate Complete the TRAINING CHECKLIST.

Speed Slayer Kill the Breeder in less than 5 minutes in Nightfall in Regular or Hardcore difficulty.

An Exceptional Accomplishment Complete Story Mode at Realistic difficulty.

Vendetta Destroyed the career of Guard Captain Eams. ("Leliana's Song" downloadable content)

New Superpower Complete all China Rising Assignments

Fly Swatter Destroy 3 Flypods within 5 seconds on any level of Insect Infestation.

Requiem of the Forgotten Kingdom Complete the Forgotten Kingdom Story

Survived Mayday Kill the Kraken for the first time in Mayday in Regular or Hardcore difficulty.

Kali Ma Complete Abaddon Asylum on any difficulty.

Abyss Survivor Cleared Infinite Survival floor 51

Guardian Angel Kill Satan with Maggy

Outlaw Defeated a certain number of gang bosses.
1/5

Oh Apocalyptic Chanbara! Cleared the story difficultly "Berserk"

Game Hunter Kill an enemy of every type in a single player campaign.

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

Hey, Catch! Throw and hit an enemy directly with a Flammable Cannister then blow them up with it

The Relic Kill Isaac with Maggy

Bulldozed In Ground Control, crush 25 enemies while driving the tank

Racer Cleared a certain number of Time Attacks.
5/10

Targets Acquired Get past the first gate in Awakening in Regular or Hardcore difficulty.

Shot Blocked Shoot the gun out of the air in 'Flashpoint' before a terrorist catches it

A budding Investigative Mind Completed 5 quests

It's All in the Reflexes Succeeded 10 Great Skill Checks.
3/10

Discriminating Buyer Use exactly one of each care package in the "Special Delivery" Special Ops mission.

Total protonic reversal Complete Return to Hell on any difficulty.

Postmaster Complete any outpost by activating all of the generators in Regular or Hardcore difficulty.

High Score Score 800,000 points in one game -- with Game Settings set to Hardcore.

Nothing More to Collect Unlock all the playable characters and bonus items.

Iron Mode Complete the game in Iron Mode.

Good Behavior Completed the game on any difficulty without killing any monsters.

The Bomb Bag Kill Satan with Cain

The Road to Greatness Complete your first Quest

Big Game Trapper Use a hypno trap to turn a Rhino friendly in Mayday in Regular or Hardcore difficulty.

Lights Out Complete the "Light 'Em Up" Special Ops mission on Veteran difficulty.

Piddlin' in the Porridge Adventure Mode - Finished a game where one player drank the Sleg

I Call Shotgun! Drive a vehicle with a Sentry Gun on the back and have it kill 5 enemies

My Ride Upgraded a vehicle to the maximum.

None more hard Complete the Campaign on Nightmare difficulty.

Undiscovered Truths Find all the intel hidden in Nightfall.

Useless Trinkets Completed the "Digging up the Past" side quest.