For all you GamerScore addicted types, we present the complete L4D 2 achievement list.

Left 4 Dead 2 has 50 achievements totalling 1000 points.
	PRICE CHOPPER	20
	Survive the Dead Center campaign.
	MIDNIGHT RIDER	20
	Survive the Dark Carnival campaign.
	RAGIN’ CAJUN	20
	Survive the Swamp Fever campaign.
	WEATHERMAN	20
	Survive the Hard Rain campaign.
	BRIDGE BURNER	20
	Survive the Parish campaign.
	STILL SOMETHING TO PROVE	35
	Survive all campaigns on Expert.
	THE REAL DEAL	35
	Survive a campaign on Expert skill with Realism mode enabled.
	CONFEDERACY OF CRUNCHES	30
	Finish a campaign using only melee weapons.
	HEAD HONCHO	15
	Decapitate 200 Infected with a melee weapon.
	CLUB DEAD	15
	Use every melee weapon to kill Common Infected.
	CHAIN OF COMMAND	15
	Kill 100 Common Infected with the chainsaw.
	TANK BURGER	30
	Kill a Tank with melee weapons.
	SHOCK JOCK	30
	Revive 10 dead Survivors with the defibrillator.
	THE QUICK AND THE DEAD	30
	Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
	ARMORY OF ONE	15
	Deploy an ammo upgrade and have your team use it.
	BURNING SENSATION	15
	Ignite 50 Common Infected with incendiary ammo.
	DISMEMBERMENT PLAN	20
	Kill 15 Infected with a single grenade launcher blast.
	SEPTIC TANK	15
	Use a bile bomb on a Tank.
	CRASS MENAGERIE	20
	Kill one of each Uncommon Infected.
	DEAD IN THE WATER	20
	Kill 10 swampy Mudmen while they are in the water.
	ROBBED ZOMBIE	15
	Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
	CL0WND	15
	Honk the noses of 10 Clowns.
	FRIED PIPER	15
	Using a Molotov, burn a Clown leading at least 10 Common Infected.
	LEVEL A CHARGE	15
	Kill a Charger with a melee weapon while they are charging.
	ACID REFLEX	15
	Kill a Spitter before she is able to spit.
	A RIDE DENIED	15
	Kill a Jockey within 2 seconds of it jumping on a Survivor.
	STACHE WHACKER	15
	Prove you are faster than Moustachio.
	GONG SHOW	15
	Prove you are stronger than Moustachio.
	GUARDIN’ GNOME	30
	Rescue Gnome Chompski from the Carnival.
	WING AND A PRAYER	30
	Defend yourself at the crashed airliner without taking damage.
	SOB STORY	30
	Navigate the sugar mill and reach the safe room without killing any Witches.
	VIOLENCE IN SILENCE	30
	Navigate the impound lot and reach the cemetary safe room without tripping any alarms.
	BRIDGE OVER TREBLED SLAUGHTER	30
	Cross the bridge finale in less than three minutes.
	HEARTWARMER	20
	In a Versus round, leave the saferoom to defibrillate a dead teammate.
	STRENGTH IN NUMBERS	15
	Form a team and beat an enemy team in 4v4 Versus or Scavenge.
	QUALIFIED RIDE	15
	As the Jockey, ride a Survivor for more than 12 seconds.
	BACK IN THE SADDLE	15
	As the Jockey, ride the Survivors twice in a single life.
	RODE HARD, PUT AWAY WET	20
	As the Jockey, ride a Survivor and steer them into a Spitter’s acid patch.
	GREAT EXPECTORATIONS	15
	As the Spitter, hit every Survivor with a single acid patch.
	A SPITTLE HELP FROM MY FRIENDS	15
	As the Spitter, spit on a Survivor being choked by a Smoker.
	SCATTERING RAM	20
	As the Charger, bowl through the entire enemy team in a single charge.
	MEAT TENDERIZER	20
	As the Charger, grab a Survivor and smash them into the ground for a solid 15 seconds.
	LONG DISTANCE CARRIER	15
	As the Charger, grab a Survivor and carry them over 80 feet.
	BEAT THE RUSH	15
	In a Survival round, get a medal only using melee weapons.
	HUNTING PARTY	15
	Win a game of Scavenge.
	GAS GUZZLER	20
	Collect 100 gas cans in Scavenge.
	CACHE AND CARRY	20
	Collect 15 gas cans in a single Scavenge round.
	SCAVENGE HUNT	15
	Stop the enemy team from collecting any gas cans during a Scavenge round.
	FUEL CRISIS	15
	Make a Survivor drop a gas can during overtime.
	GAS SHORTAGE	20
	Cause 25 gas can drops as a Special Infected.