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