Full list of all 101 Left 4 Dead 2 achievements. It takes around 80-100 hours to unlock all of the achievements in the base game on Windows.
The base game contains 52 achievements, and there are 7 DLC packs containing 49 achievements.
Plays games with free weekend players and helps them survive a campaign.
As the Spitter, spit on a Survivor being choked by a Smoker.
Cause 25 gas can drops as a Special Infected.
Spread cheer by helping a free holiday player survive a campaign.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
Revive 10 dead Survivors with the defibrillator.
Make a Survivor drop a gas can during overtime.
Collect 100 gas cans in Scavenge.
As the Charger, bowl through the entire enemy team in a single charge.
As the Jockey, ride the Survivors twice in a single life.
As the Jockey, ride a Survivor for more than 12 seconds.
In a Survival round, get a medal only using melee weapons.
As the Charger, grab a Survivor and carry them over 80 feet.
Navigate the sugar mill and reach the safe room without killing any Witches.
Kill a Charger with a melee weapon while they are charging.
Prove you are stronger than Moustachio.
Prove you are faster than Moustachio.
Collect 15 gas cans in a single Scavenge round.
As the Charger, grab a Survivor and smash them into the ground for a solid 15 seconds.
Kill 15 Infected with a single grenade launcher blast.
Finish a campaign using only melee weapons.
Survive a campaign on Expert skill with Realism mode enabled.
Rescue Gnome Chompski from the Carnival.
Honk the noses of 10 Clowns.
Survive all campaigns on Expert.
Form a team and beat an enemy team in 4v4 Versus or Scavenge.
Win a game of Scavenge.
As the Spitter, hit every Survivor with a single acid patch.
Stop the enemy team from collecting any gas cans during a Scavenge round.
As the Jockey, ride a Survivor and steer them into a Spitter's acid patch.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
Kill a Tank with melee weapons.
Defend yourself at the crashed airliner without taking damage.
Kill 10 swampy Mudmen while they are in the water.
Ignite 50 Common Infected with incendiary ammo.
Decapitate 200 Infected with a melee weapon.
Use every melee weapon to kill Common Infected.
Survive the Parish campaign.
Cross the bridge finale in less than three minutes.
Navigate the impound lot and reach the cemetery safe room without tripping any alarms.
Kill 100 Common Infected with the chainsaw.
Survive the Hard Rain campaign.
Kill one of each Uncommon Infected.
Survive the Swamp Fever campaign.
Survive the Dark Carnival campaign.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
Use a bile bomb on a Tank.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
Survive the Dead Center campaign.
Deploy an ammo upgrade and have your team use it.
Kill a Spitter before she is able to spit.
Collect 10 items dropped by a Fallen Survivor.
Play 5 full games of Scavenge on The Port.
Play 6 Mutations.
Open 5 foot lockers.
Using the M60, kill 25 infected without letting go of the trigger.
Knock off the heads of 18 infected with the golf club.
As the Charger, grab a Survivor and crash them through 8 chairs at the wedding.
Play the new Midnight Riders song on a jukebox.
Survive The Passing Campaign.
Kill a Tank only with damage from the original Survivors.
Kill a Special Infected with an exploding barrel.
As a Special Infected, incap someone who is trying to sacrifice themselves.
Have all 3 generators running at once in "The Sacrifice" finale.
Have Bill sacrifice himself for the team.
Complete "The Sacrifice".
Survive the Cold Stream campaign on any difficulty.
Play a Versus game on Dead Air from start to finish.
Collect three gifts dropped by Special Infected in Versus Mode.
Kill 53,599 infected. You made sure the dead won't rise anymore!
Find the golden crowbars hidden in the Left 4 Dead 1 survival maps.
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
Survive The Last Stand campaign on Expert Realism.
Revive an incapacitated teammate while a Tank is nearby.
Survive for 30 minutes on any official survival map.
Survive for 10 minutes on any official map in Versus Survival.
With a sharp melee weapon, cut a Smoker's tongue before he ensnares you.
Kill 20 Jockeys with the shovel or pitchfork.
Rescue three Survivors from a single rescue closet.
Kill a Witch using only a sharp melee weapon, without anyone getting incapacitated or killed.
Kill a pouncing Hunter with a shotgun.
Kill the Witch bride with a single shotgun blast on expert difficulty.
Instantly kill a Survivor as the Charger.
As the Spitter, spit on a Survivor who is pinned by a Charger.
As the Spitter, spit on a Survivor who is pinned by a Hunter.
As the Hunter, land a 25 damage pounce.
Destroy 20 gascans as the Spitter.
As the Boomer, vomit on a Survivor without having direct line of sight with them.
Complete The Last Stand campaign in 13 minutes or less, without any Survivors dying.
Escape Liberty Mall's Atrium before the first Tank appears
On the concert finale, survive until the helicopter arrives without leaving the stage
Earn a gold medal on any official survival map.
Earn a silver medal on any official survival map.
Earn a bronze medal on any official Survival map.
Survive The Last Stand campaign on any difficulty.
Destroy a Tank's rock in mid-air.
Discover the hidden room in the Last Stand campaign
If you are reading this achievement, Gabe Newell has successfully launched Gnome Chompski into space.