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Stowaway In Voyage of Despair, spend 5 consecutive rounds in the Cargo Hold

West Side for Life In Blood of the Dead, reach Round 20 without leaving the West Side of the island

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

The First Harmonic Score your first harmonic in Needle Hills.

No Friend of Orcs Defeat 100 Orcs

Super Collision Course Either on (at least) your 2nd playthrough or in Hard (or greater) difficulty, conquer the fierce battle at Glaivend Basin without using any items!

Epic Tale of Sorcerers Acquired all trophies.

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

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

Tree Hugger Defend the Ent

I came in like a Resogun Accumulate a total Wrecking combo of 1,000 in Demolition mode

Zombie Genocide Master Kill 72,000 zombies

Ryder owns Goliath Complete the Plains of Goliath.

Chimp on the Barbie In Ascension, kill a space monkey with a fire trap.

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.

Undiscovered Truths Find all the intel hidden in Nightfall.

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

Gotta Catch'em All Collect all secrets.

Tag, You're it! Use the Spotter Scope to tag 60 enemies or items in Open Combat Missions

Acidic Alchemy In IX, Get a kill with the Acid Trap in each of its craftable locations

I Know a Shortcut In Voyage of Despair, take every fast travel path in a single game

Deliver This Complete the "Special Delivery" Special Ops mission on Veteran difficulty.

2-fer Using the EBR-14, kill 2 enemies with 1 bullet 5 times in 'Payload' without sounding the alarm

Elevator Out of Order Reach the roof in 'Highrise' under 45 seconds

A New Hope See all of the endings of Ninja
Scroll of the Demon Blade.

Chuck Greene: Cross-dresser? Change into all pieces of clothing in the game

The First One is the Hardest Get your first 1,000,000+ combo

The third faction Rescue all the Buddies from their respective predicaments

Feel the Beat, Y'all! Complete "Feel the Beat, Y'all!" challenge

Don't make me pull the trigger! Survive for 5 minutes in Demolition mode

Can you dig it? Complete "Can you dig it?" challenge

Last Blood At the end of Guns of Stygia, kill all the enemies on the walkways before the explosions do

Thanatophobia WITHOUT using the Architect, complete the game dying 15 times or less

Favorite Clear all missions of any rank consecutively using the same gun parts.

Hi Score Collect 1,000,000 points over all story levels you have played.

Flyswatter Destroy all helicopters in the "Vertigo" Special Ops mission.

Dinner Date Pigsy's Perfect 10: Collect all hidden food and pin-up girls.

A Little Pack Here, a Little Punch There In Voyage of Despair, use the Pack-a-Punch at every possible location in a single game

Mindful Vandalism Place a sticker or a decoration on another player's sackperson.

Donut Mess with a Cop Unlock Officer Dick.

Bookwyrm This is proof that you've become quite familiar with the Library. How to obtain this is kind of a secret, but if you take the time to do a bit of reading now and then, you should be pleasantly surprised.

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

Middle-earth Extermination Defeat 1000 Enemies

Nemesis Complete "Nemesis" challenge

Going to the Vet Earn the "Veteran" Challenge Collection.
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High Score In Zombie Rush, obtain a Personal Score of 250,000

Pinnacle Complete the "Vertigo" Special Ops mission on Veteran difficulty.

Let the Dog Out Complete "Let the Dog Out" challenge

Chatterbox Sometimes, after you've found a discovery point or when you're at a save point, you have the opportunity to press L3 to initiate a conversation between your companions. This is proof that you've experienced many Things and had a lot of Opinions about them.