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