AddictingSins

I Got This In The Darkest Shore, survive the initial beach rush without using any machine gun turrets.

Come On And ... Slam 10 zombies at once in Outbreak.

Egg-stra Devastation! Complete the Egg-Stra XP challenge and then destroy a hive in the Devastation DLC package.

Head Trauma Use every type of melee weapon on a zombie

Worth Every Penny Acquire 1000 credits in one month.

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

Distinguished Service Collect 50 Team Boosts.

Skirmish - Chapter XIV Finish the levels from Chapter XIV in Squire difficulty

Prime Directive Shatter Skeletron Prime.

Don't burn yourself out Defeated the Keeper

Doctor Heal over 500,000 hit points.

Off My Planet Recover the Hyperwave Beacon.

Appease the Volcano Gods An NPC is destined to die in a trial by fire.

Artful extraction Absorb your third Boss Stem Cell

Extreme Manhunt Complete a Seasonal Manhunt mission on Challenge difficulty or above.

Tailor-made Chose a perfectly fitting armor

ARCHIVIST Collect all documents

Finished, without fear. Finish the game with two Boss Stem Cells active

Street Fighter Complete all Dragon's Teeth Assignments

High Score In Zombie Rush, obtain a Personal Score of 250,000

Nightwing Revenge Obtain 78 medals on the original Arkham City and Nightwing Bundle Pack ranked maps (as Nightwing)

Avenged Confronted the culprit behind the Vael family's murder. ("The Exiled Prince" downloadable content)

Memento Gave Sebastian a family heirloom. ("The Exiled Prince" downloadable content)

A Bridge To Somewhere Extend the bridge in Awakening in Regular or Hardcore difficulty.

Robin Revenge Obtain 78 medals on the original Arkham City and Robin Bundle Pack ranked maps (as Robin)

Survivor Survive until Round 25 in Outbreak.

Alright, Alright Survive until round 10 in Infection.

Man No More Build a suit of powered armor.

Real Estate Agent Have all possible town NPCs living in your world.

Supernova Get 3 stars on each of the first 14 Echoes

Acquire Waffle Weapons! Obtain the Ray Gun, DG-2, and the Monkey Bomb at the same time in a game. (Map Pack 3 only)

The Ultimate Sacrifice In Zetsubou No Shima, retrieve the Skull of Nan Sapwe.

PC Load Letter Use the 3D printer 15 times in a single match in Outbreak.

Test Subjects Use sheep as test subjects in 6 levels

Bloody Lust Kill Isaac with Samson

Golden Idol Perform every Single Player Skillshot in the game

Defending Our Way Of Life Rescue a hideout.

Wander and the Forbidden Clear the game in hard difficulty

Grounded Kill an airborne enemy with Brigitte's Whip Shot in Quick or Competitive Play.

Master at arms Unlock all the the Warrior skills and their upgrades

Back in Action Perform 10 revivals.

Real men don't need a map Just in case you picked up a shielding map

Multiplicitous In Zombie Rush, get your score multiplier up to 100

Land Baron Get five islands on your DigiFarm.

A Blank Card Kill Isaac with Eden

A More Perfect Union Finish what you started.

Endangered Lizards Killed all shining lizards

Deadhead Get 150 zombie headshots in a single game. (Map Pack 2 only)

Reaper Defeated the Harvester ("The Golems of Amgarrak" downloadable content)

Escaped Awakening Escape Awakening for the first time in Regular or Hardcore difficulty.