SniperSam

Things That Go Ka-Boom Learn how to craft Exploding Arrows

Electric Whisper Learn how to craft Electric Arrows

Have You Tried Turning it Off and On? Use a Shock Stick to disable an enemy Sentry Gun

Think She'll Notice? Destroy all of the cars in the mansion garage in 'Oligarch'

Silence of the Llamas Expel the Infestation at the Farm

Perkaholics Anonymous! Survive until round 20 without buying a single Perk. (Map Pack 3 only)

CHEMICAL PLANT Restored! Restore the CHEMICAL PLANT Stage Gate.
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Little Bighorn Win at least one game in competitive mode.

Keys to the City Reach Mumbai Mastery Level 20.

The Power of Rico Compels You Exorcise the Infestation at the Church

Deer in the Headlights Stab five stunned enemies in a row in the "Light 'Em Up" Special Ops mission.

Stunning! Pigsy's Perfect 10: Stun 5 enemies using one single EMP device.

40 Knives! Kill 40 zombies with the bowie knife. (Map Pack 3 only)

Solino Chainsaw Massacre Eradicate the Infestation at the Compound

Pack Rat Successfully extract with 50 Data Drives in Hazard Zone

Texas Ranger Disable 20 enemies with your bare fists.

They Came From the Lake Liquidate the Infestation at the Lake

Rag Doll Apprentice Earn Bronze on all challenges

Feeding Time Feed the Narwhal.

Bane of Thedas Handed victory to the archdemon by killing Ferelden's last Grey Warden. ("Darkspawn Chronicles" downloadable content)

The Signal Set out on a rescue mission

Demons on a Plane Obliterate the Infestation at the Crash

The Flying Dead Abolish the Infestation on the Mountain

Act II Complete Act II.

Rookie of the Year Earn a B Rank in the Trial of Initiation

I Heard THAT Collect all 12 Audio Logs

Icebreaker Equip the Icebreaker.

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

The 40-Yard Digital Dash Breach: Succeed 3 Data Sphere deliveries.

Copter Rider Have a snack on the Petit-Copter!

Helo Hat Trick Destroy each objective helicopter in 'Reactor' with a different Armament

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

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

Retribution Dealt with the mercenaries that killed the Vael family. ("The Exiled Prince" downloadable content)

Soul Survivor Reach round 15 in Nazi Zombies without getting revived. (Map Pack 2 only)

Frequent Flyer! Use the teleporter 8 times. (Map Pack 3 only)

Gear Five! Reach Ultimate Vault Hunter level 5.

Mission Complete Reach Colorado Mastery Level 20.

Up Down Up Down Reached the top of the excavation site

Under The Ice Finish the main quest in The Pale Reach.

David vs Goliath In Checkmate, destroy the APC using an RC-XD

Lockdown! Activated the Lock Palette feature

Sayōnara Reach Hokkaido Mastery Level 20.

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

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

Salute Me Achieve the rank of Lieutenant.

Wheeled Warrior Earn a T1 Mastery Badge with any Vehicle

Sub Zero Complete the "Arctic Recon" Special Ops mission on Veteran difficulty.

Guac is Extra Find Dave the Burrito.

Iceolated Discovered a way through the abandoned mine