Survive the Dead Center campaign.
Survive The Passing Campaign.
Survive the Hard Rain campaign.
Spread cheer by helping a free holiday player survive a campaign.
Use every melee weapon to kill Common Infected.
Complete "The Sacrifice".
Survive the Cold Stream campaign on any difficulty.
Kill a Spitter before she is able to spit.
Decapitate 200 Infected with a melee weapon.
Survive the Dark Carnival campaign.
Ignite 50 Common Infected with incendiary ammo.
Use a bile bomb on a Tank.
Kill 100 Common Infected with the chainsaw.
Kill one of each Uncommon Infected.
Deploy an ammo upgrade and have your team use it.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
Kill a Charger with a melee weapon while they are charging.
Prove you are faster than Moustachio.
Revive an incapacitated teammate while a Tank is nearby.
As the Spitter, spit on a Survivor who is pinned by a Charger.
Find the golden crowbars hidden in the Left 4 Dead 1 survival maps.
Survive The Last Stand campaign on Expert Realism.
As the Spitter, spit on a Survivor who is pinned by a Hunter.
Survive The Last Stand campaign on any difficulty.
Earn a gold medal on any official survival map.
Honk the noses of 10 Clowns.
Play a Versus game on Dead Air from start to finish.
Earn a silver medal on any official survival map.
Earn a bronze medal on any official Survival map.
Plays games with free weekend players and helps them survive a campaign.
Collect three gifts dropped by Special Infected in Versus Mode.
Instantly kill a Survivor as the Charger.
As a Special Infected, incap someone who is trying to sacrifice themselves.
Have all 3 generators running at once in "The Sacrifice" finale.
Kill a Special Infected with an exploding barrel.
Play 5 full games of Scavenge on The Port.
Destroy 20 gascans as the Spitter.
As the Hunter, land a 25 damage pounce.
As the Boomer, vomit on a Survivor without having direct line of sight with them.
Discover the hidden room in the Last Stand campaign
Complete The Last Stand campaign in 13 minutes or less, without any Survivors dying.
On the concert finale, survive until the helicopter arrives without leaving the stage
Kill a Witch using only a sharp melee weapon, without anyone getting incapacitated or killed.
Survive for 30 minutes on any official survival map.
Earn a gold medal on every official survival map.
Earn a silver medal on every official survival map.
Earn a bronze medal on every official survival map
Escape Liberty Mall's Atrium before the first Tank appears
Rescue three Survivors from a single rescue closet.
Kill 53,599 infected. You made sure the dead won't rise anymore!
Survive for 10 minutes on any official map in Versus Survival.
Kill 20 Jockeys with the shovel or pitchfork.
As the Charger, grab a Survivor and crash them through 8 chairs at the wedding.
Kill the Witch bride with a single shotgun blast on expert difficulty.
Destroy a Tank's rock in mid-air.
Kill a pouncing Hunter with a shotgun.
With a sharp melee weapon, cut a Smoker's tongue before he ensnares you.
Using the M60, kill 25 infected without letting go of the trigger.
As the Charger, bowl through the entire enemy team in a single charge.
Cause 25 gas can drops as a Special Infected.
Collect 15 gas cans in a single Scavenge round.
Have Bill sacrifice himself for the team.
Open 5 foot lockers.
Kill a Tank only with damage from the original Survivors.
Play the new Midnight Riders song on a jukebox.
Knock off the heads of 18 infected with the golf club.
Play 6 Mutations.
Collect 10 items dropped by a Fallen Survivor.
As the Spitter, hit every Survivor with a single acid patch.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
Navigate the sugar mill and reach the safe room without killing any Witches.
Navigate the impound lot and reach the cemetery safe room without tripping any alarms.
Survive the Parish campaign.
Survive the Swamp Fever campaign.
Revive 10 dead Survivors with the defibrillator.
Kill 15 Infected with a single grenade launcher blast.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
Kill 10 swampy Mudmen while they are in the water.
Finish a campaign using only melee weapons.
Survive all campaigns on Expert.
Make a Survivor drop a gas can during overtime.
As the Spitter, spit on a Survivor being choked by a Smoker.
Prove you are stronger than Moustachio.
Stop the enemy team from collecting any gas cans during a Scavenge round.
Collect 100 gas cans in Scavenge.
Win a game of Scavenge.
In a Survival round, get a medal only using melee weapons.
As the Charger, grab a Survivor and carry them over 80 feet.
As the Charger, grab a Survivor and smash them into the ground for a solid 15 seconds.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
As the Jockey, ride a Survivor and steer them into a Spitter's acid patch.
Survive a campaign on Expert skill with Realism mode enabled.
As the Jockey, ride the Survivors twice in a single life.
As the Jockey, ride a Survivor for more than 12 seconds.
Defend yourself at the crashed airliner without taking damage.
Rescue Gnome Chompski from the Carnival.
Cross the bridge finale in less than three minutes.
Kill a Tank with melee weapons.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
Form a team and beat an enemy team in 4v4 Versus or Scavenge.
If you are reading this achievement, Gabe Newell has successfully launched Gnome Chompski into space.
