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.
Form a team and beat an enemy team in 4v4 Versus or Scavenge.
Spread cheer by helping a free holiday player survive a campaign.
Survive all campaigns on Expert.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
Cause 25 gas can drops as a Special Infected.
Collect 100 gas cans in Scavenge.
Make a Survivor drop a gas can during overtime.
Kill 10 swampy Mudmen while they are in the water.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
Kill a Charger with a melee weapon while they are charging.
Rescue Gnome Chompski from the Carnival.
Cross the bridge finale in less than three minutes.
Revive 10 dead Survivors with the defibrillator.
In a Survival round, get a medal only using melee weapons.
Kill 15 Infected with a single grenade launcher blast.
Survive a campaign on Expert skill with Realism mode enabled.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
Kill a Tank with melee weapons.
Stop the enemy team from collecting any gas cans during a Scavenge round.
Collect 15 gas cans in a single Scavenge round.
Survive the Swamp Fever campaign.
Defend yourself at the crashed airliner without taking damage.
As the Spitter, spit on a Survivor being choked by a Smoker.
As the Jockey, ride a Survivor for more than 12 seconds.
As the Charger, grab a Survivor and smash them into the ground for a solid 15 seconds.
As the Charger, grab a Survivor and carry them over 80 feet.
As the Charger, bowl through the entire enemy team in a single charge.
Win a game of Scavenge.
As the Spitter, hit every Survivor with a single acid patch.
Ignite 50 Common Infected with incendiary ammo.
Use every melee weapon to kill Common Infected.
Finish a campaign using only melee weapons.
Survive the Parish campaign.
Survive the Hard Rain campaign.
Navigate the sugar mill and reach the safe room without killing any Witches.
As the Jockey, ride the Survivors twice in a single life.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
As the Jockey, ride a Survivor and steer them into a Spitter's acid patch.
Kill 100 Common Infected with the chainsaw.
Navigate the impound lot and reach the cemetery safe room without tripping any alarms.
Deploy an ammo upgrade and have your team use it.
Use a bile bomb on a Tank.
Decapitate 200 Infected with a melee weapon.
Survive the Dark Carnival campaign.
Honk the noses of 10 Clowns.
Prove you are faster than Moustachio.
Prove you are stronger than Moustachio.
Kill one of each Uncommon Infected.
Survive the Dead Center campaign.
Kill a Spitter before she is able to spit.
Play 5 full games of Scavenge on The Port.
Collect 10 items dropped by a Fallen Survivor.
Kill a Tank only with damage from the original Survivors.
As the Charger, grab a Survivor and crash them through 8 chairs at the wedding.
Play 6 Mutations.
Open 5 foot lockers.
Using the M60, kill 25 infected without letting go of the trigger.
Survive The Passing Campaign.
Knock off the heads of 18 infected with the golf club.
Play the new Midnight Riders song on a jukebox.
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.
Complete "The Sacrifice".
Have Bill sacrifice himself for the team.
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!
Kill 20 Jockeys with the shovel or pitchfork.
Kill the Witch bride with a single shotgun blast on expert difficulty.
Destroy 20 gascans as the Spitter.
Instantly kill a Survivor as the Charger.
As the Hunter, land a 25 damage pounce.
Earn a bronze medal on every official survival map
Earn a silver medal on every official survival map.
Earn a gold medal on every official survival map.
Survive for 10 minutes on any official map in Versus Survival.
Escape Liberty Mall's Atrium before the first Tank appears
Complete The Last Stand campaign in 13 minutes or less, without any Survivors dying.
Kill a Witch using only a sharp melee weapon, without anyone getting incapacitated or killed.
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.
Rescue three Survivors from a single rescue closet.
Survive for 30 minutes on any official survival map.
Find the golden crowbars hidden in the Left 4 Dead 1 survival maps.
As the Boomer, vomit on a Survivor without having direct line of sight with them.
On the concert finale, survive until the helicopter arrives without leaving the stage
Destroy a Tank's rock in mid-air.
Kill a pouncing Hunter with a shotgun.
Discover the hidden room in the Last Stand campaign
Revive an incapacitated teammate while a Tank is nearby.
With a sharp melee weapon, cut a Smoker's tongue before he ensnares you.
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 Expert Realism.
Survive The Last Stand campaign on any difficulty.
If you are reading this achievement, Gabe Newell has successfully launched Gnome Chompski into space.