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