- Juggling Act
Drop 5 different Tier 2 weapons in one wave.
- Lifting a Dumbell
Kill a Circus Husk with a LAW.
- Punk'd
Unlock 10 of the 13 Circus Achievements along with any Abusement Park achievement.
- Elephant Gun
Land the killing blow on a Circus Fleshpound with a Pistol.
- The Big Hunt
Kill a Circus Scrake with a Crossbow.
- Seeing Double
Kill 5 Circus Crawlers with a Bullpup in one wave.
- Small Hands
Kill 3 Circus Clots in a wave with the Lever Action Rifle.
- Taking Down the Big Top
Kill 4 Circus Zeds in 1 ZED time chain with a Melee weapon.
- Sparring with a Master
Kill a Circus Gorefast with a Melee weapon.
- Flea Circus
Win a Long Game on Abusement Park on Normal Difficulty.
- Ringmaster
Kill the "Ring Leader" (Circus Patriarch)
- Clearing Clown Alley
Kill 5 Circus Bloats in one game.
- Burning up the Midway
Kill 10 Circus Clots with a Fire-based weapon.
- Departure Gate
Win a Long Game on Departed on Suicidal Difficulty.
- Mr. Perky
Get All of your Perks up to Level 5.
- Still Alive
Win a Long Game on Aperture on Hard Difficulty.
- Golden Potato
Get into GLaDOS' core on Aperture.
- Science Got Done
Win a Long Game on Aperture on Normal Difficulty.
- Blooper Reel
Turn 500 Zeds into Giblets using the M79.
- Hot Cross Fun
Kill 25 Burning Specimens with a Crossbow.
- Mountaineer
Win a Long Game on Mountain Pass on Suicidal Difficulty.
- Death To The Mad Scientist
Defeat the Patriarch on Suicidal.
- Merry Men
Kill the Patriarch when everyone is ONLY using Crossbows.
- Bitter Irony
Kill 2 Scrakes with a Chainsaw in a Single Wave.
- That Bloody Well Hurts!
Win a Long Game on Hospital Horrors on Hard Difficulty.
- Pound Cake
Complete all new map achievements on Hard Difficulty.
- Private Security
Win a Long Game on Suburbia on Hard Difficulty.
- Raccoon King of the Dark Forest
Win a Long Game on Wyre, on Hard Difficulty.
- Summer of 2009
Complete a Long Game on all 3 Summer 2009 maps on Hard Difficulty.
- Explosive Personality
As Demolitions, kill 1000 Specimens with the Pipebomb.
- Gone Mental
Win a Long Game on Bedlam, on Hard Difficulty.
- Missed Connection
Win a Long Game on Filth's Cross on Hard Difficulty.
- Waste Land
Win a Long Game on Biohazard on Hard Difficulty.
- Burst Pipe
Win a Long Game on Waterworks on Hard Difficulty.
- Warehouse Forklift Operator
Win a Long Game on Crash on Hard Difficulty.
- Steel Worker
Win a Long Game on Foundry, on Hard Difficulty.
- Crushed Ice
Win a Long Game on Icebreaker on Hard Difficulty.
- Silent Night, Evil Night
Win a Long Game on Santa's Evil Lair on Hard Difficulty.
- Departure Lounge
Win a Long Game on Departed on Hard Difficulty.
- The Hard War
Complete a Long Game on all 5 Core Maps on Hard Difficulty.
- Cattle Farmer
Win a Long Game on Farm on Hard Difficulty.
- Gone Camping
Win a Long Game on Mountain Pass on Hard Difficulty.
- Hard Boss
Win a Long Game on Offices on Hard Difficulty.
- Killer Junior
Kill 20 crawlers in mid-air with the M79.
- Lab Assistant
Win a Long Game on Biotics Lab on Hard Difficulty.
- Duke of the Manor
Win a Long Game on Manor on Hard Difficulty.
- Hard Pub Crawl
Win a Long Game on West London on Hard Difficulty.
- A Bit Barmy
Win a Long Game on Bedlam, on Normal Difficulty.
- Long, Hot Summer
Complete a Long Game on all 3 Summer 2009 maps on Normal Difficulty.
- Ice Cube
Win a Long Game on Icebreaker on Normal Difficulty.
- Piece of Cake
Complete all new map achievements on Normal Difficulty.
- Departure Gallery
Win a Long Game on Departed on Normal Difficulty.
- The L.A.W. That Broke The Camel's Back
Deliver the Killing Blow to the Patriarch with a L.A.W. Rocket.
- Master Surgeon
As a Medic, Kill 8 Specimens using a Knife in a Single Wave.
- Neighborhood Watch
Win a Long Game on Suburbia on Normal Difficulty.
- Waste Disposal
Win a Long Game on Biohazard on Normal Difficulty.
- Gimme a Plaster!
Win a Long Game on Hospital Horrors on Normal Difficulty.
- Warehouse Janitor
Win a Long Game on Crash on Normal Difficulty.
- Too Close For Comfort
Finish off a Fleshpound using a Melee Attack.
- Squirrel King of the Dark Forest
Win a Long Game on Wyre, on Normal Difficulty.
- Thin-Ice Pirouette
Complete 10 Waves when the Rest of your Team has Died.
- Daytrip
Win a Long Game on Mountain Pass on Normal Difficulty.
- The Boss
Win a Long Game on Offices on Normal Difficulty.
- The Long War
Complete a Long Game on all 5 Core Maps on Normal Difficulty.
- Lab Cleaner
Win a Long Game on Biotics Lab on Normal Difficulty.
- Getting Chunky
Obliterate 10 Zeds at once with the Pipe Bomb.
- Slight Drip
Win a Long Game on Waterworks on Normal Difficulty.
- Tin Man
Win a Long Game on Foundry, on Normal Difficulty.
- Careful Spender
Kill 4 Specimens with a Single Shot from a Hunting Shotgun.
- Experimentilottacide
Kill 10,000 Specimens.
- Fascist Dietitian
Kill 200 Bloats.
- Running Late
Win a Long Game on Filth's Cross on Normal Difficulty.
- Bad Santa
Unlock 10 of the 13 Christmas Achievements along with any Christmas Map achievement.
- Walking in A Winter Horror Land
Win a Long Game on Santa's Evil Lair on Normal Difficulty.
- Flaming Hell, That was Close
As Firebug, kill the Husk with the Flamethrower before he hurts anyone.
- That's not Santa!
[2010 Xmas] Kill 3 Christmas Bloats with the Bullpup in one wave.
- It's What's Inside That Counts
Turn 500 Specimens into Giblets.
- Homer's Heroes
Kill 100 Sirens.
- Deck the Halls with Buckets o' Blood
[2010 Xmas] Kill 3 Christmas Zeds in 1 ZED time chain with a Melee weapon.
- Eggnog Anyone?
[2010 Xmas] Get covered in Christmas Bloat Bile and live for 10 seconds on Hard, Suicidal, or Hell on Earth.
- Fending off Mrs. Claws
[2010 Xmas] Kill 3 Christmas Stalkers with a Lever Action Rifle without reloading.
- I Like To Watch
Aquire 5 Minutes of "Zed-Time".
- Lord of the Manor
Win a Long Game on Manor on Normal Difficulty.
- SCAR'd
Kill 1000 Specimens with the SCAR.
- Quarter Pounder With Ease
Turn 5 Fleshpounds into Giblets.
- Keep Those Sneakers Off the Floor!
Kill 20 Stalkers with Explosives.
- Random Axe of Kindness
Kill 15 Specimens with a Fire Axe in a Single Wave.
- Pub Crawl
Win a Long Game on West London on Normal Difficulty.
- Straight Rush
Kill the Patriarch Before he has a Chance to Heal.
- Self Medicator
In Co-op Mode, Use Syringe on Yourself 100 Times.
- Who Brings a Gun to a Snow Ball Fight?
[2010 Xmas] Kill a Christmas Husk with any Pistol.
- Toasted Jack Frost
[2010 Xmas] Kill the Christmas Scrake with a Fire-based weapon.
- Let Them Burn
Get 1000 points of burn damage with the MAC-10.
- Chicken Farmer
Win a Long Game on Farm on Normal Difficulty.
- Merry Friggin Christmas
[2010 Xmas] Kill the Christmas Patriarch.
- Tis Better to Give than to Receive
[2010 Xmas] Drop 3 Tier 3 weapons for others (with which they kill at least one Christmas Zed).
- Back to Work
[2010 Xmas] Kill 20 Christmas Clots in one wave.
- Experimentimillicide
Kill 1,000 Specimens.
- Philanthropist
Give 1,000 Pounds to Teammates who have 50% of Your Cash or Less.
- Social Outburst
Kill 8 Specimens with One Grenade.
- Rudolph, the Bloody Nosed Reindeer
[2010 Xmas] Kill a Christmas Crawler with a Crossbow.
- Experimenticenticide
Kill 100 Specimens.
- It's Not Easy Being Greasy
Cause a Specimen to Die by Luring them into Bloat Acid.
- Dot of Doom
Get 25 headshots in a row with the EBR while using the Laser Sight.
- Scientist from Hell
Win a Long Game on Biotics Lab on Hell on Earth Difficulty.
- Wolf King of the Dark Forest
Win a Long Game on Wyre on Hell on Earth Difficulty.
- Warehouse Manager
Win a Long Game on Crash on Hell on Earth Difficulty.
- Not Dead Yet!
Win a Long Game on Hospital Horrors on Hell on Earth Difficulty.
- SWAT
Win a Long Game on Suburbia on Hell on Earth Difficulty.
- Devil Cake
Complete all new map achievements on Hell On Earth Difficulty.
- I'm Making a Note Here, Huge Success
Win a Long Game on Aperture on Hell on Earth Difficulty.
- On Top of the Big Top
Win a Long Game on Abusement Park on Hell on Earth Difficulty.
- On the Rocks
Beat Ice Cave on Suicidal Difficulty
- Anti Freeze
Beat Ice Cave on Hell on Earth Difficulty
- Devil's Co-pilot
Beat Hellride on Hell on Earth Difficulty
- Second Cousins
Beat Hillbilly Horror on Hard Difficulty
- First Cousins (Once Removed)
Beat Hillbilly Horror on Suicidal Difficulty
- First Cousins
Beat Hillbilly Horror on Hell on Earth Difficulty
- 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
- Here is to us
Beat Moonbase on Normal Difficulty
- Attempting Re-entry
Beat Moonbase on Hard Difficulty
- Amusing Death
Beat Moonbase on Suicidal Difficulty
- One Giant Leap (Back) for Mankind
Beat Moonbase on Hell on Earth Difficulty
- Gimli That Axe!
Get the Not-a-war-hammer Achievement in Dwarfs!?
- Astro Buffer Afficiando
Beat Steamland on Normal Difficulty
- Modified Psychoacceleration Achiever
Beat Steamland on Hard Difficulty
- Fractional Neutron Activator
Beat Steamland on Suicidal Difficulty
- Advanced Omega Wave Resonance Explorer
Beat Steamland on Hell on Earth Difficulty
- Simplified Force Adhesion Afficianado
Beat Steamland in Objective Mode on Normal Difficulty
- Oscillating Hydrogen Transition Achiever
Beat Steamland in Objective Mode on Hard Difficulty
- Alpha Wave Osteooxidation Activator
Beat Steamland in Objective Mode on Suicidal Difficulty
- Tachyon Cytoneutralization Explorer
Beat Steamland in Objective Mode on Hell on Earth Difficulty
- Hide and go Puke
[2013 Summer] Destroy all the Pukey the Clown dolls
- Arcade Gamer
[2013 Summer] Complete the Pop the Clot, the Strong Man and the Grenade Toss games
- Full Charge
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
- Single-shot Equalizer
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
- Single-Load Doom Bombardier
Kill a ZED with a direct (unexploded) shot from the Orca Bomb Propeller or the M-79/M32
- Turbo Executioner
Kill 5 zeds in ZED time without reloading with Dr. T's LDS or Bullpup
- Mrs. Punkd
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
- Longshoreman
Beat Fright Yard on Normal Difficulty
- Gang Crew
Beat Fright Yard on Hard Difficulty
- Stevedore
Beat Fright Yard on Suicidal Difficulty
- Wharfinger
Beat Fright Yard on Hell on Earth Difficulty
- Fork Lift Operator
Beat Fright Yard in Objective Mode on Normal Difficulty
- Truck Driver
Beat Fright Yard in Objective Mode on Hard Difficulty
- Crane Operator
Beat Fright Yard in Objective Mode on Suicidal Difficulty
- Shipping Magnate
Beat Fright Yard in Objective Mode on Hell on Earth Difficulty
- Claw Machine Master
Attach the crane hook within 125 seconds
- Ex-scientist
Collect all the bile without a contamination
- 777
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
- Most Bang for the Buck
Kill 10 Halloween zeds in explosions using the Seeker 6 or the M32 within 5 seconds
- Death
Beat Hell on Normal Difficulty
- King Minos
Beat Hell on Hard Difficulty
- Cerberus
Beat Hell on Suicidal Difficulty
- Lucifer
Beat Hell on Hell on Earth Difficulty
- Brain Fart
Beat Forgotten on Normal Difficulty
- Agnosia
Beat Forgotten on Hard Difficulty
- Amnesia
Beat Forgotten on Suicidal Difficulty
- Dementia
Beat Forgotten on Hell on Earth Difficulty
- No Time for Love, Dr. Jones
Win a short round on KF-Hell playing as or with Harchier Spebbington
- Home Brewer
Beat Siren's Belch on Normal Difficulty
- Micro Brewer
Beat Siren's Belch on Hard Difficulty
- Master Brewer
Beat Siren's Belch on Suicidal Difficulty
- Trappist Monk
Beat Siren's Belch on Hell on Earth Difficulty
- Oktoberfest Master
Collect all the Beer Steins
- Peasant
Beat Stronghold on Normal Difficulty
- Squire
Beat Stronghold on Hard Difficulty
- Prince
Beat Stronghold on Suicidal Difficulty
- King
Beat Stronghold on Hell on Earth Difficulty
- Rich Evil Uncle
Collect all the Treasure Bags
- Cattle Class
Beat Transit on Normal Difficulty
- Economy Comfort
Beat Transit on Hard Difficulty
- Business Class
Beat Transit on Suicidal Difficulty
- First Class
Beat Transit on Hell on Earth Difficulty
- Day-trip
Beat Transit in Objective Mode on Normal Difficulty
- Long weekend
Beat Transit in Objective Mode on Hard Difficulty
- Serious vacation
Beat Transit in Objective Mode on Suicidal Difficulty
- Moved to Paris!
Beat Transit in Objective Mode on Hell on Earth Difficulty
- Nitro Boost!
Transit - Get the Nitro to the Objective in 135 seconds or less
- Totally Metal
Transit - Kill 250 Zeds before completing the welding objective
- Multi-pass
Transit - Pick up the door key
- Science Hater
Transit - Destroy all the DNA vials
- Doctor WHO??
Transit - Get all Objective achievements AND beat KFO Transit on Hard or above to unlock Dr Rachel Clamely.
- Gone clubbing
Beat Clandestine on Normal Difficulty
- Rack 'em up
Beat Clandestine on Hard Difficulty
- Burned out
Beat Clandestine on Suicidal Difficulty
- Hangover from Hell
Beat Clandestine on Hell Difficulty
- Skull Cracker
Clandestine - Destroy 30 skulls
- Cave of Wonder
Beat ThrillsChills on Normal Difficulty
- Cavern of Pain
Beat ThrillsChills on Hard Difficulty
- Grotto of Terror
Beat ThrillsChills on Suicidal Difficulty
- Hollow of Horror
Beat ThrillsChills on Hell Difficulty
- All shook up
Destroy all (15) Snow Globes