TheZoneEnder

Heavenly Joy Shoot 200 bullets consecutively with the Chaingun.

Burning Out of Control Complete any monster-filled level with 100% kills, items, and secrets.

Hoarder Finish a level with 100% items picked up.

Doormat Crush a corpse in a door.

Clean Slate Kill all monsters in any monster-filled level on 'Hurt me plenty' or higher.

More Like a Dream Complete a level on Nightmare difficulty.

Timing Is Everything Kill 2 enemies with a single barrel explosion.

Groovy Get 3 multi-kills with the Shotgun.

An Important Looking Door Find a secret area.

Not So Friendly Fire Cause an enemy to kill another enemy.

Chimerical Cure Defeat the Chimera (Hell on Earth)

Sharp Instincts Defeat an Impaler (Hard)

Don't You Die On Me Revive 100 teammates in Versus multiplayer (social or competitive)
100/100

Seasoned Pro Defeat 300 enemies.

Retail Therapy Purchase an item from the supply box.

A Harsh Reality Escape the care center.

Bring Out the Big Guns Stun the Girl with Requiem.

It's Been a Long Night Reach the courtyard of the care center.

Chop Chop Defeat three zombies with a hatchet finishing attack.

Tailor Made Upgrade a weapon.

Descent Into Darkness Reach the basement of the care center.

Thirty is Something Reach Level 30 with any Specialist

Blood! More Blood! Use 300 microsamples of infected blood.

Deadly Duet Defeat the two singers in the main story.

Like Mother, Like Daughter Unlock a drawer with a lockpick.

The Power of Blood Craft an item using the blood collector.

Science! Unlock a crafting recipe using analysis.

Fatal Dose Defeat a zombie using the hemolytic injector.

Out of Sight, Out of Mind Store an item in the item box as Grace.

The Hunt Begins Destroy one Mr. Raccoon memoriam.

Untouchable Parry an enemy attack.

Déjà vu Encounter an outbreak in Wrenwood.

Can I Borrow This? Throw a weapon dropped by an enemy.

A Cut Above Defeat an Impaler (Hell on Earth)

Alpha Omega Defeat an Alpha Scavenger on Hell on Earth

Backroom Deal Open the backroom in Onslaught

Small Arms Complete a Survival Long match without firing a primary weapon.

All Mired Up Complete Operation 3

Shellshocker Defeat the Chimera (Hard)

Survival of the Fittest Survive 25 Multiplayer Survival Matches
25/25

Scientifically Proven Complete the Season 4 Campaign

Bioengineering 201 Defeat Moorcroft (Hard)

Black Gold Get 10 kills with a single use of the Oil Rig drill Trap