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