Left 4 Dead 2

ACID REFLEX

Common66.2%

Kill a Spitter before she is able to spit.

A RIDE DENIED

Common64.6%

Kill a Jockey within 2 seconds of it jumping on a Survivor.

ARMORY OF ONE

Common52.8%

Deploy an ammo upgrade and have your team use it.

CRASS MENAGERIE

Uncommon39.7%

Kill one of each Uncommon Infected.

PRICE CHOPPER

Uncommon39.4%

Survive the Dead Center campaign.

SEPTIC TANK

Uncommon33.9%

Use a bile bomb on a Tank.

GNOME ALONE

Uncommon29.3%

If you are reading this achievement, Gabe Newell has successfully launched Gnome Chompski into space.

TORCH BEARER

Uncommon28.9%

Survive The Passing Campaign.

MIDNIGHT RIDER

Uncommon27.3%

Survive the Dark Carnival campaign.

CHAIN OF COMMAND

Uncommon25.7%

Kill 100 Common Infected with the chainsaw.

HEAD HONCHO

Uncommon25.3%

Decapitate 200 Infected with a melee weapon.

BURNING SENSATION

Uncommon24.2%

Ignite 50 Common Infected with incendiary ammo.

WEATHERMAN

Uncommon22.4%

Survive the Hard Rain campaign.

GREAT EXPECTORATIONS

Uncommon21.5%

As the Spitter, hit every Survivor with a single acid patch.

SUPREME SACRIFICE

Uncommon20.8%

Complete "The Sacrifice".

BRIDGE BURNER

Uncommon20.1%

Survive the Parish campaign.

CLUB DEAD

Uncommon20.0%

Use every melee weapon to kill Common Infected.

RAGIN' CAJUN

Uncommon19.7%

Survive the Swamp Fever campaign.

QUALIFIED RIDE

Uncommon18.3%

As the Jockey, ride a Survivor for more than 12 seconds.

BACK IN THE SADDLE

Uncommon17.5%

As the Jockey, ride the Survivors twice in a single life.

STREAM CROSSER

Uncommon16.0%

Survive the Cold Stream campaign on any difficulty.

FRIED PIPER

Uncommon15.8%

Using a Molotov, burn a Clown leading at least 10 Common Infected.

DEAD IN THE WATER

Uncommon15.7%

Kill 10 swampy Mudmen while they are in the water.

MEAT TENDERIZER

Uncommon15.3%

As the Charger, grab a Survivor and smash them into the ground for a solid 15 seconds.

KILL BILL

Uncommon15.1%

Have Bill sacrifice himself for the team.

ELEPHANT IN THE ROOM

Uncommon15.0%

Revive an incapacitated teammate while a Tank is nearby.

ROBBED ZOMBIE

Uncommon15.0%

Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.

RODE HARD, PUT AWAY WET

Uncommon14.6%

As the Jockey, ride a Survivor and steer them into a Spitter's acid patch.

GHOST OF CHRISTMAS PRESENT

Uncommon14.1%

Spread cheer by helping a free holiday player survive a campaign.

GRAVE ROBBER

Uncommon13.5%

Collect 10 items dropped by a Fallen Survivor.

DISMEMBERMENT PLAN

Uncommon12.8%

Kill 15 Infected with a single grenade launcher blast.

KILLING THEM SWIFTLY TO THIS SONG

Uncommon12.8%

Play the new Midnight Riders song on a jukebox.

A SPITTLE HELP FROM MY FRIENDS

Uncommon11.9%

As the Spitter, spit on a Survivor being choked by a Smoker.

KITE LIKE A MAN

Uncommon11.9%

Kill a Tank only with damage from the original Survivors.

CACHE GRAB

Uncommon11.8%

Open 5 foot lockers.

LONG DISTANCE CARRIER

Uncommon11.2%

As the Charger, grab a Survivor and carry them over 80 feet.

FORE!

Uncommon10.6%

Knock off the heads of 18 infected with the golf club.

CL0WND

Uncommon10.5%

Honk the noses of 10 Clowns.

VIOLENCE IN SILENCE

Rare9.9%

Navigate the impound lot and reach the cemetery safe room without tripping any alarms.

SCATTERING RAM

Rare8.6%

As the Charger, bowl through the entire enemy team in a single charge.

Valve Gift Grab 2011 – L4D2

Rare8.2%

Collect three gifts dropped by Special Infected in Versus Mode.

LEVEL A CHARGE

Rare8.1%

Kill a Charger with a melee weapon while they are charging.

TANK BURGER

Rare7.9%

Kill a Tank with melee weapons.

STILL STANDING

Rare7.5%

Survive The Last Stand campaign on any difficulty.

GUARDIN' GNOME

Rare7.2%

Rescue Gnome Chompski from the Carnival.

CHAOS GENERATOR

Rare7.0%

Have all 3 generators running at once in "The Sacrifice" finale.

HUNTING PARTY

Rare6.8%

Win a game of Scavenge.

TIL IT GOES CLICK

Rare6.8%

Using the M60, kill 25 infected without letting go of the trigger.

SOB STORY

Rare6.7%

Navigate the sugar mill and reach the safe room without killing any Witches.

BARREL ROLLED

Rare6.5%

Kill a Special Infected with an exploding barrel.

ROCKY HORROR PICTURE THROW

Rare6.5%

Destroy a Tank's rock in mid-air.

GET SKEETED ON

Rare6.4%

Kill a pouncing Hunter with a shotgun.

SCAVENGE HUNT

Rare6.3%

Stop the enemy team from collecting any gas cans during a Scavenge round.

STACHE WHACKER

Rare6.3%

Prove you are faster than Moustachio.

SHOCK JOCK

Rare5.9%

Revive 10 dead Survivors with the defibrillator.

GONG SHOW

Rare5.4%

Prove you are stronger than Moustachio.

CACHE AND CARRY

Rare5.2%

Collect 15 gas cans in a single Scavenge round.

WING AND A PRAYER

Very rare4.9%

Defend yourself at the crashed airliner without taking damage.

BRIDGE OVER TREBLED SLAUGHTER

Very rare4.7%

Cross the bridge finale in less than three minutes.

CONNECTING FIGHTS

Very rare4.5%

Play a Versus game on Dead Air from start to finish.

GETTING STARTED

Very rare4.4%

Earn a bronze medal on any official Survival map.

CONFEDERACY OF CRUNCHES

Very rare4.1%

Finish a campaign using only melee weapons.

LICKETY-SPLIT

Very rare4.1%

With a sharp melee weapon, cut a Smoker's tongue before he ensnares you.

THE QUICK AND THE DEAD

Very rare4.1%

Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.

FUEL CRISIS

Very rare3.8%

Make a Survivor drop a gas can during overtime.

MUTANT OVERLORD

Very rare3.8%

Play 6 Mutations.

FAT NINJA

Very rare3.3%

As the Boomer, vomit on a Survivor without having direct line of sight with them.

ACID BATH

Very rare2.7%

As the Spitter, spit on a Survivor who is pinned by a Hunter.

GOOD GUY NICK

Very rare2.6%

Plays games with free weekend players and helps them survive a campaign.

THE REAL DEAL

Very rare2.5%

Survive a campaign on Expert skill with Realism mode enabled.

BEAT THE RUSH

Very rare2.4%

In a Survival round, get a medal only using melee weapons.

GAS GUZZLER

Very rare2.4%

Collect 100 gas cans in Scavenge.

STILL SOMETHING TO PROVE

Very rare2.3%

Survive all campaigns on Expert.

GAS SHORTAGE

Very rare2.2%

Cause 25 gas can drops as a Special Infected.

I SPIT ON YOUR GRAVE

Very rare2.0%

As the Spitter, spit on a Survivor who is pinned by a Charger.

ON OUR WAY

Very rare2.0%

Earn a silver medal on any official survival map.

HEARTWARMER

Very rare1.9%

In a Versus round, leave the saferoom to defibrillate a dead teammate.

PORT OF SCAVENGE

Very rare1.9%

Play 5 full games of Scavenge on The Port.

STRENGTH IN NUMBERS

Very rare1.9%

Form a team and beat an enemy team in 4v4 Versus or Scavenge.

NEW HAIRCUT

Very rare1.8%

Kill a Witch using only a sharp melee weapon, without anyone getting incapacitated or killed.

SACRIFIZZLE

Very rare1.8%

As a Special Infected, incap someone who is trying to sacrifice themselves.

WEDDING CRASHER

Very rare1.7%

As the Charger, grab a Survivor and crash them through 8 chairs at the wedding.

HOUSEHOLD NAMES

Very rare1.5%

Discover the hidden room in the Last Stand campaign

FLIGHT DECK

Very rare1.4%

Instantly kill a Survivor as the Charger.

THIS IS WHERE THE FUN BEGINS

Very rare1.4%

Earn a gold medal on any official survival map.

POLE POSITION

Very rare1.2%

Escape Liberty Mall's Atrium before the first Tank appears

THREE’S A CROWD

Very rare1.1%

Rescue three Survivors from a single rescue closet.

THE MAIN ATTRACTION

Ultra rare0.7%

On the concert finale, survive until the helicopter arrives without leaving the stage

ONE HIT WONDER

Ultra rare0.5%

As the Hunter, land a 25 damage pounce.

Z-GENOCIDEST 2: EPISODE 2

Ultra rare0.5%

Kill 53,599 infected. You made sure the dead won't rise anymore!

PURE SATISFACTION

Ultra rare0.4%

Kill 20 Jockeys with the shovel or pitchfork.

SHOTGUN WEDDING

Ultra rare0.4%

Kill the Witch bride with a single shotgun blast on expert difficulty.

SUPREME SURVIVALIST

Ultra rare0.4%

Survive for 30 minutes on any official survival map.

THE LAST DASH

Ultra rare0.4%

Complete The Last Stand campaign in 13 minutes or less, without any Survivors dying.

GOLDEN FREEMAN

Ultra rare0.3%

Find the golden crowbars hidden in the Left 4 Dead 1 survival maps.

SPITFIRE

Ultra rare0.3%

Destroy 20 gascans as the Spitter.

THE BIG TEN

Ultra rare0.3%

Survive for 10 minutes on any official map in Versus Survival.

THE LAST FRONTIER

Ultra rare0.3%

Survive The Last Stand campaign on Expert Realism.

A LITTLE HACK AND SLASH

Ultra rare0.2%

Earn a bronze medal on every official survival map

KILLING SPREE

Ultra rare0.2%

Earn a gold medal on every official survival map.

LIKE LAMBS TO THE SLAUGHTER

Ultra rare0.2%

Earn a silver medal on every official survival map.