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