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.
Cause 25 gas can drops as a Special Infected.
Collect 100 gas cans in Scavenge.
Form a team and beat an enemy team in 4v4 Versus or Scavenge.
Win a game of Scavenge.
Make a Survivor drop a gas can during overtime.
Stop the enemy team from collecting any gas cans during a Scavenge round.
Collect 15 gas cans in a single Scavenge round.
As the Jockey, ride a Survivor and steer them into a Spitter's acid patch.
As the Jockey, ride the Survivors twice in a single life.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
As the Spitter, spit on a Survivor being choked by a Smoker.
As the Charger, bowl through the entire enemy team in a single charge.
As the Jockey, ride a Survivor for more than 12 seconds.
As the Charger, grab a Survivor and carry them over 80 feet.
As the Spitter, hit every Survivor with a single acid patch.
As the Charger, grab a Survivor and smash them into the ground for a solid 15 seconds.
Kill a Charger with a melee weapon while they are charging.
In a Survival round, get a medal only using melee weapons.
Survive all campaigns on Expert.
Survive a campaign on Expert skill with Realism mode enabled.
Finish a campaign using only melee weapons.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
Navigate the sugar mill and reach the safe room without killing any Witches.
Kill a Tank with melee weapons.
Navigate the impound lot and reach the cemetery safe room without tripping any alarms.
Cross the bridge finale in less than three minutes.
Survive the Parish campaign.
Use every melee weapon to kill Common Infected.
Defend yourself at the crashed airliner without taking damage.
Revive 10 dead Survivors with the defibrillator.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
Decapitate 200 Infected with a melee weapon.
Kill 100 Common Infected with the chainsaw.
Kill 10 swampy Mudmen while they are in the water.
Kill 15 Infected with a single grenade launcher blast.
Prove you are faster than Moustachio.
Rescue Gnome Chompski from the Carnival.
Prove you are stronger than Moustachio.
Kill a Spitter before she is able to spit.
Survive the Hard Rain campaign.
Honk the noses of 10 Clowns.
Ignite 50 Common Infected with incendiary ammo.
Kill one of each Uncommon Infected.
Survive the Dark Carnival campaign.
Use a bile bomb on a Tank.
Survive the Swamp Fever campaign.
Spread cheer by helping a free holiday player survive a campaign.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
Deploy an ammo upgrade and have your team use it.
Survive the Dead Center campaign.
Play 5 full games of Scavenge on The Port.
As the Charger, grab a Survivor and crash them through 8 chairs at the wedding.
Using the M60, kill 25 infected without letting go of the trigger.
Play 6 Mutations.
Open 5 foot lockers.
Play the new Midnight Riders song on a jukebox.
Kill a Tank only with damage from the original Survivors.
Survive The Passing Campaign.
Collect 10 items dropped by a Fallen Survivor.
Knock off the heads of 18 infected with the golf club.
As a Special Infected, incap someone who is trying to sacrifice themselves.
Kill a Special Infected with an exploding barrel.
Complete "The Sacrifice".
Have Bill sacrifice himself for the team.
Have all 3 generators running at once in "The Sacrifice" finale.
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!
Destroy 20 gascans as the Spitter.
As the Hunter, land a 25 damage pounce.
Instantly kill a Survivor as the Charger.
As the Spitter, spit on a Survivor who is pinned by a Hunter.
As the Spitter, spit on a Survivor who is pinned by a Charger.
As the Boomer, vomit on a Survivor without having direct line of sight with them.
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.
Find the golden crowbars hidden in the Left 4 Dead 1 survival maps.
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.
Destroy a Tank's rock in mid-air.
Survive for 30 minutes on any official survival map.
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.
Kill 20 Jockeys with the shovel or pitchfork.
Kill a Witch using only a sharp melee weapon, without anyone getting incapacitated or killed.
Complete The Last Stand campaign in 13 minutes or less, without any Survivors dying.
Survive The Last Stand campaign on Expert Realism.
On the concert finale, survive until the helicopter arrives without leaving the stage
Kill the Witch bride with a single shotgun blast on expert difficulty.
Discover the hidden room in the Last Stand campaign
Survive The Last Stand campaign on any difficulty.
Rescue three Survivors from a single rescue closet.
Revive an incapacitated teammate while a Tank is nearby.
Escape Liberty Mall's Atrium before the first Tank appears
Kill a pouncing Hunter with a shotgun.
If you are reading this achievement, Gabe Newell has successfully launched Gnome Chompski into space.