Achievements are meta-goals defined outside of Killing Floor's direct gameplay parameters. There are currently 252 total achievements, 130 of which are map completion achievements.
Twisted Christmas 2010
Merry Friggin Christmas
Kill the Christmas Patriarch.
Cracked the Nutcracker!
Land the killing blow on a Christmas Fleshpound with a Knife.
Can't Catch Me!
Kill 2 Christmas Gorefasts with a Melee weapon from behind in one wave.
Toasted Jack Frost
Kill the Christmas Scrake with a Fire-based weapon.
That's not Santa!
Kill 3 Christmas Bloats with the Bullpup in one wave.
Rudolph, the Bloody Nosed Reindeer
Kill a Christmas Crawler with a Crossbow.
Not So Silent Night
Kill a Christmas Siren with an undetonated LAW rocket.
Fending off Mrs. Claws
Kill 3 Christmas Stalkers with a Lever Action Rifle without reloading.
Who Brings a Gun to a Snow Ball Fight?
Kill a Christmas Husk with any Pistol.
Deck the Halls with Buckets o' Blood
Kill 3 Christmas Zeds in 1 ZED time chain with a Melee weapon.
Tis Better to Give than to Receive
Drop 3 Tier 3 weapons for others (with which they kill at least one Christmas Zed).
Get covered in Christmas Bloat Bile and live for 10 seconds on Hard, Suicidal, or Hell on Earth.
Back to Work
Kill 20 Christmas Clots in one wave.
Unlock 10 of the 13 Christmas Achievements along with any Christmas Map achievement.
Twisted Christmas 2011
Kill 15 Husks with the Husk Fireball Launcher.
Kill a Scrake, a Fleshpound, and the Patriarch with the Claymore Sword within one map.
Kill ONLY 1 specimen while expending a full M4 Assault Rifle magazine.
Hit a Scrake with the M203 Rifle grenade to kill him.
I love ze Healing not ze Hurting
Heal others for 3000 points of health with the MP5 SMG.
Italian Meat Pasta
Kill 12 zeds with a full magazine from the Combat Shotgun.
Kill a specimen with every shot from your Revolver for one magazine.
We Have Ourselves a Cowboy
Hold dual 9mm, dual hand cannons and Dual Revolvers.
A Bloody Christmas Carol
Kill 15 XMas Clots, 5 xmas Stalkers, 5 XMas Crawlers, 1 XMas Siren and 1 XMas Bloat.
Twisted Christmas 2012
Have my axe
Kill 30 Fleshpounds with the Dwarfs!? axe with back attacks.
One Small Step for Man
Kill 500 Zeds with the Schneidzekk Medic Gun while you are falling.
But It's All Red!
Collect all 16 Z.E.D. Gun pieces.
Game Over, Man!
Have 20 Zeds you slowed with the Z.E.D. gun killed.
Gimli That Axe!
Get the Not-a-war-hammer Achivement in Dwarfs!?
Summer Sideshow 2011
Kill the "Ring Leader" (Circus Patriarch).
Sparring with a Master
Kill a Circus Gorefast with a Melee Weapon.
Kill 2 Circus Stalkers with a Melee weapon to the back in one wave.
Kill 5 Circus Crawlers with a Bullpup in one wave.
Clearing Clown Alley
Kill 5 Circus Bloats in one game.
The Big Hunt
Kill a Circus Scrake with a Crossbow.
Lifting a Dumbell
Kill a Circus Husk with a LAW.
Kill 3 Circus Clots in a wave with the Lever Action Rifle.
Land the killing blow on a Circus Fleshpound with a Pistol
Drop 5 different Tier 2 weapons in one wave.
Survive 10 seconds after being screamed at by a Circus Siren on Hard or above.
Taking Down the Big Top
Kill 4 Circus Zeds in 1 ZED time chain with a Melee weapon.
Burning up the Midway
Kill 10 Circus Clots with a Fire-based weapon.
Unlock 10 of the 13 Circus Achievements along with any Abusement Park achievement.
Summer Sideshow 2013
Hide and go Puke
[2013 Summer] Destroy all the Pukey the Clown dolls
[2013 Summer] Complete the Pop the Clot, the Strong Man and the Grenade Toss games
Have 5 Breaker Boxes 100% repaired at the same time
Extended Motion Protector
[2013 Summer] Protect the Ringmaster during the escort mission so that he does not get hit more than 15 times
Guardian Assault Protector
Protect the ringmaster during the defense mission so that he does not get hit more than 15 times
Golden 3 Crown Note
Get all 3 gold bars without the carriers taking damage while they have them
Get 4 of 6 of the 2013 Summer Event in-game level Achievements, one Standard and one Objective Mode map completion Achievement, plus the Punk'd Achievement to unlock Steampunk Mrs. Foster. NOTE: There are 4 weapon specific Acheivements (below) that are part of Summer Sideshow 2013, but these do not factor into Mrs.Punkd.
Halloween Sideshow (Halloween 2011)
Sparkling in the Twilight
Kill The Vampire Patriarch in Bedlam.
Carving The Jack O' Lantern
Decapitate a burning Halloween specimen in Bedlam.
The Scene is Zed
Kill 250 Halloween Specimens in Bedlam.
Win a Long Bedlam Match During the Halloween Event on Hard.
This is No Ordinary Rabbit!
Kill 25 Halloween Scrakes in Bedlam.
Trick, not Treat
Kill 5 Halloween Specimens with any gun without reloading
Rule The Roost
Get all 6 achievements and unlock Commando Chicken.
Hillbilly Horror 2012
Free the souls of the 25 Gnomes hidden on Hillbilly Horror in 1 game
Meet Your Maker!
Kill 1000 Hillbilly Zeds
Kill 15 Hillbilly Crawlers with the Tommy Gun or MKb
Rippin' It Up
Kill a Hillbilly Husk and another Hillbilly Zed in the same shot with the Buzzsaw Bow or M99
I Am Become Death
Kill 5 Hillbilly Zeds in 10 seconds with the Scythe or Axe
Set 3 Hillbilly Gorefasts on fire with the Flare Pistol or Trench Gun
Get the 6 Special Achievements plus 1 Hillbilly Horror Map Achievement to unlock the Grim Reaper
Hillbilly Horror Fright Yard (Halloween 2013)
Claw Machine Master
Attach the crane hook within 125 seconds
Collect all the bile without a contamination
Win Fuel on the first try
Blinding Big Brother
Destroy all 30 Cameras
Fire and Forget
Kill a Halloween Fleshpound and Scrake in the same explosion with the Seal Squeal Harpoon Bomber or the LAW
Under The Weather
Use Bile or the Flamethrower to kill one of each Halloween Zed, including the Patriarch
Most Bang for the Buck
Kill 10 Halloween zeds in explosions using the Seeker 6 or the M32 within 5 seconds
Potato Fools 2011 & 2012
Expensive but delicious! Brought to you by Dr. Dougley and Lord Ned (Buy the £70.000 Potato (Weapon)
Get into GLaDOS' core on Aperture.
- The achievements were also available during the 2013 Halloween event
- The achievements were also available during the 2014 Halloween event
Let Them Burn
Get 1000 points of burn damage with the MAC-10.
Obliterate 10 Zeds at once with the Pipe Bomb.
Random Axe of Kindness
Kill 15 Specimens with a Fire Axe in a Single Wave.
Kill 4 Specimens with a Single Shot from a Hunting Shotgun.
As a Medic, Kill 8 Specimens using a Knife in a Single Wave.
Flaming Hell, That was Close
As Firebug, kill the Husk with the Flamethrower before he hurts anyone.
Kill 2 Scrakes with a Chainsaw in a Single Wave.
The L.A.W. That Broke The Camel's Back
Deliver the Killing Blow to the Patriarch with a L.A.W. Rocket.
Heal 200 teammates with the MP7's medication dart.
Kill 4 Stalkers in a game with the Nailgun
Explosion of Love
Heal yourself plus 5 other players with one grenade
Kill 4 different types of Zeds with headshots with 4 shots from the Long Musket or the M14 without reloading
Assault Flayer Ordinance
Push a scrake back with the direct fire from a Hunting Shotgun or alt fire from the Multi-Chamber ZED Thrower
Kill 20 crawlers in mid-air with the M79 (explosive kill).
Kill 1000 Specimens with the SCAR.
Hot Cross Fun
Kill 25 Burning Specimens with a Crossbow.
Turn 500 Zeds into Giblets using the M79 (in solo mode).
Kill the Patriarch when everyone is ONLY using Crossbows.
As Demolitions, kill 1000 Specimens with the Pipebomb.
Kill 100 Fleshpounds with the AA12.
Dot of Doom
Get 25 headshots in a row with the EBR while using the Laser Sight.
Kill 8 Specimens with One Grenade.
Set a total of 200 Zeds on fire in Hillbilly Horror (trench-gun).
Kill 6 Zeds with one magazine, without reloading
Single-Load Doom Bombardier
Kill a ZED with a direct (unexploded) shot from the Orca Bomb Propeller or the M-79/M32
Kill 5 zeds in ZED time without reloading with Dr. T's LDS or Bullpup
Individual kill achievements
It's Not Easy Being Greasy
Cause a Specimen to Die by Luring them into Bloat Acid.
Too Close For Comfort
Finish off a Fleshpound using a Melee Attack.
Kill the Patriarch Before he has a Chance to Heal.
Death To The Mad Scientist
Defeat the Patriarch on Suicidal.
Multiple kill achievements
Kill 100 Specimens.
Kill 1,000 Specimens.
Kill 10,000 Specimens.
Quarter Pounder With Ease
Turn 5 Fleshpounds into Giblets.
Dignity for the Dead
Kill 10 Specimens Feeding on Dead Teammates Corpses.
Keep Those Sneakers Off the Floor!
Kill 20 Stalkers with Explosives.
Kill 100 Sirens.
Kill 200 Bloats.
It's What's Inside That Counts
Turn 500 Specimens into Giblets.
Give 1,000 Pounds to teammates who have 50% of your cash or less.
In co-op mode, use syringe on yourself 100 times.
I Like To Watch
Acquire 5 minutes of "Zed-Time".
Complete 10 waves when the rest of your team has died.
Get all of your perks up to level 5.
No Time for Love, Dr. Jones
Win a short round on KF-Hell playing as or with Harchier Spebbington or with someone who has this achievement.