No missable achievements (plus 101 unknown)
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Kill a Spitter before she is able to spit.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
Deploy an ammo upgrade and have your team use it.
Kill one of each Uncommon Infected.
Survive the Dead Center campaign.
Use a bile bomb on a Tank.
If you are reading this achievement, Gabe Newell has successfully launched Gnome Chompski into space.
Survive The Passing Campaign.
Survive the Dark Carnival campaign.
Kill 100 Common Infected with the chainsaw.
Decapitate 200 Infected with a melee weapon.
Ignite 50 Common Infected with incendiary ammo.
Survive the Hard Rain campaign.
As the Spitter, hit every Survivor with a single acid patch.
Complete "The Sacrifice".
Survive the Parish campaign.
Use every melee weapon to kill Common Infected.
Survive the Swamp Fever campaign.
As the Jockey, ride a Survivor for more than 12 seconds.
As the Jockey, ride the Survivors twice in a single life.
Survive the Cold Stream campaign on any difficulty.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
Kill 10 swampy Mudmen while they are in the water.
As the Charger, grab a Survivor and smash them into the ground for a solid 15 seconds.
Have Bill sacrifice himself for the team.
Revive an incapacitated teammate while a Tank is nearby.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
As the Jockey, ride a Survivor and steer them into a Spitter's acid patch.
Spread cheer by helping a free holiday player survive a campaign.
Collect 10 items dropped by a Fallen Survivor.
Kill 15 Infected with a single grenade launcher blast.
Play the new Midnight Riders song on a jukebox.
As the Spitter, spit on a Survivor being choked by a Smoker.
Kill a Tank only with damage from the original Survivors.
Open 5 foot lockers.
As the Charger, grab a Survivor and carry them over 80 feet.
Knock off the heads of 18 infected with the golf club.
Honk the noses of 10 Clowns.
Navigate the impound lot and reach the cemetery safe room without tripping any alarms.
As the Charger, bowl through the entire enemy team in a single charge.
Collect three gifts dropped by Special Infected in Versus Mode.
Kill a Charger with a melee weapon while they are charging.
Kill a Tank with melee weapons.
Survive The Last Stand campaign on any difficulty.
Rescue Gnome Chompski from the Carnival.
Have all 3 generators running at once in "The Sacrifice" finale.
Win a game of Scavenge.
Using the M60, kill 25 infected without letting go of the trigger.
Navigate the sugar mill and reach the safe room without killing any Witches.
Kill a Special Infected with an exploding barrel.
Destroy a Tank's rock in mid-air.
Kill a pouncing Hunter with a shotgun.
Prove you are faster than Moustachio.
Stop the enemy team from collecting any gas cans during a Scavenge round.
Revive 10 dead Survivors with the defibrillator.
Prove you are stronger than Moustachio.
Collect 15 gas cans in a single Scavenge round.
Defend yourself at the crashed airliner without taking damage.
Cross the bridge finale in less than three minutes.
Play a Versus game on Dead Air from start to finish.
Earn a bronze medal on any official Survival map.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
Finish a campaign using only melee weapons.
With a sharp melee weapon, cut a Smoker's tongue before he ensnares you.
Make a Survivor drop a gas can during overtime.
Play 6 Mutations.
As the Boomer, vomit on a Survivor without having direct line of sight with them.
As the Spitter, spit on a Survivor who is pinned by a Hunter.
Plays games with free weekend players and helps them survive a campaign.
Survive a campaign on Expert skill with Realism mode enabled.
Collect 100 gas cans in Scavenge.
In a Survival round, get a medal only using melee weapons.
Survive all campaigns on Expert.
Cause 25 gas can drops as a Special Infected.
Earn a silver medal on any official survival map.
As the Spitter, spit on a Survivor who is pinned by a Charger.
Form a team and beat an enemy team in 4v4 Versus or Scavenge.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
Play 5 full games of Scavenge on The Port.
Kill a Witch using only a sharp melee weapon, without anyone getting incapacitated or killed.
As a Special Infected, incap someone who is trying to sacrifice themselves.
As the Charger, grab a Survivor and crash them through 8 chairs at the wedding.
Discover the hidden room in the Last Stand campaign
Instantly kill a Survivor as the Charger.
Earn a gold medal on any official survival map.
Escape Liberty Mall's Atrium before the first Tank appears
Rescue three Survivors from a single rescue closet.
On the concert finale, survive until the helicopter arrives without leaving the stage
As the Hunter, land a 25 damage pounce.
Kill 53,599 infected. You made sure the dead won't rise anymore!
Kill the Witch bride with a single shotgun blast on expert difficulty.
Kill 20 Jockeys with the shovel or pitchfork.
Survive for 30 minutes on any official survival map.
Complete The Last Stand campaign in 13 minutes or less, without any Survivors dying.
Find the golden crowbars hidden in the Left 4 Dead 1 survival maps.
Destroy 20 gascans as the Spitter.
Survive for 10 minutes on any official map in Versus Survival.
Survive The Last Stand campaign on Expert Realism.
Earn a bronze medal on every official survival map
Earn a gold medal on every official survival map.
Earn a silver medal on every official survival map.