Thy_Big_Chungus

Easy Rhino In Dead Ops Arcade, use a Speed Boost to blast through 20 or more enemies at one time.

Supportive Squad Complete 50 missions without anyone being downed.
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Thank You For Being a Friend Forge a Friendship

The Smorgasbord Injure a single zombie with your melee weapon, the pistol and the shotgun, then stealth kill it.

Freefall Drop from a height of at least 16 feet (5 meters).

Medieval Mode Finish a match with Ash (Army of Darkness), Lord Arthur and Henry the Red in your team

Beyond Limitless Potential Further upgrade the abilities of the P-Organ.

Dubious Challenge Clear Challenge Level 1 in Kaycee's Mod.

Who's next, huh? Perform 100 finishers

The Arrogant Queen Put an end to the Queen's reign.

Ringo Knock up an enemy as high as possible.

Group Photo Get 50 Target Markers with the camera.

"Sorry, kid." Succeeded as a Mentor

Omae Wa Mou Shindeiru As Sam, kill 5 creatures within 30 seconds using melee attacks.

The Stars Read every newspaper edition

Taking Names Complete all 6 Calling Card Challenges in any Multiplayer Category

Some wounds never heal Escape the Past.

Below Zero Freeze a Vova mid-air

Bet You Didn't See That Coming Using Martin's Flash Baton, interrupt a bioweapon that has grabbed a teammate.

Conviction Kill 5 enemies in 2 seconds.

Return to Sender Remix another dreamer's creation and send them the result

The Hermit Enter the family crypt

The Devil Play the second puppet theatre sequence

A Stand Up Fight Finish a mission on Extreme Difficulty.

Ray.README Complete "Ray.README"

I Need Healing As Sam, escape without using health-recovering items (Can still be healed by teammates).

The Temperance Play the first puppet theatre sequence

Death Complete the game's story

Jar Jar Bonks Hit a Pusflinger with a Bait Jar.

Troubleshooting Give your car a few swift kicks (maybe it’ll help?)

Jack of All Blades, Master of Guns Level up all 8 Special Weapons to Stage 3

To absent friends Pay your respects to sheriff Lanning.

Venerated Warrior In IX, defeat the most venerated opponent

Trigger Discipline Complete a mission on Intense Difficulty or above without anyone taking friendly fire damage.

Left Ventricle Find the Secret in The Nursery.

Chemist Craft consumables of all types
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You have to start somewhere Upgrade a skill

You can't outrun Evil Run over a Survivor with a possessed car

Wield a Fist of Iron In Gorod Krovi, wield the Gauntlet of Siegfried.

K.I.A. Let the VA know about the lumberjack's death.

Backtrack Find the Secret in 300 Below.

Never get off the boat Find the Soviet connection in Laos.

Lining up the Fun Reach rank 3 or higher in the Lining up the Fun imp quest

Invincible! Finish the whole campaign without taking any damage.

Ray of hope Patch things up with Jess.

Take A Bow Kill a Crone with the Bow.

I'm Smelting! Smelt 10,000 bars of metal.

The Four Horsemen Finish a match with four Ashes on your team

One Man's Poison... Use the cure station to kill 5 host zombies at once in Infection.

Feeling Blue Collect all Blue Files in the Story.