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.
Survive a campaign on Expert skill with Realism mode enabled.
Survive all campaigns on Expert.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
Revive 10 dead Survivors with the defibrillator.
As the Charger, bowl through the entire enemy team in a single charge.
Defend yourself at the crashed airliner without taking damage.
In a Survival round, get a medal only using melee weapons.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
Kill a Charger with a melee weapon while they are charging.
Collect 100 gas cans in Scavenge.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
Cross the bridge finale in less than three minutes.
Form a team and beat an enemy team in 4v4 Versus or Scavenge.
Kill 10 swampy Mudmen while they are in the water.
Navigate the sugar mill and reach the safe room without killing any Witches.
Cause 25 gas can drops as a Special Infected.
Rescue Gnome Chompski from the Carnival.
Navigate the impound lot and reach the cemetery safe room without tripping any alarms.
As the Jockey, ride a Survivor for more than 12 seconds.
As the Jockey, ride the Survivors twice in a single life.
As the Jockey, ride a Survivor and steer them into a Spitter's acid patch.
As the Spitter, hit every Survivor with a single acid patch.
As the Spitter, spit on a Survivor being choked by a Smoker.
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.
Win a game of Scavenge.
Collect 15 gas cans in a single Scavenge round.
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.
Prove you are faster than Moustachio.
Finish a campaign using only melee weapons.
Survive the Swamp Fever campaign.
Kill one of each Uncommon Infected.
Survive the Dead Center campaign.
Kill 15 Infected with a single grenade launcher blast.
Use every melee weapon to kill Common Infected.
Survive the Hard Rain campaign.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
Kill 100 Common Infected with the chainsaw.
Use a bile bomb on a Tank.
Decapitate 200 Infected with a melee weapon.
Ignite 50 Common Infected with incendiary ammo.
Kill a Tank with melee weapons.
Survive the Dark Carnival campaign.
Honk the noses of 10 Clowns.
Deploy an ammo upgrade and have your team use it.
Survive the Parish campaign.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
Kill a Spitter before she is able to spit.
As the Charger, grab a Survivor and crash them through 8 chairs at the wedding.
Play 6 Mutations.
Kill a Tank only with damage from the original Survivors.
Play 5 full games of Scavenge on The Port.
Survive The Passing Campaign.
Using the M60, kill 25 infected without letting go of the trigger.
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.
Have all 3 generators running at once in "The Sacrifice" finale.
Kill a Special Infected with an exploding barrel.
As a Special Infected, incap someone who is trying to sacrifice themselves.
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!
Survive for 30 minutes on any official survival map.
Survive The Last Stand campaign on Expert Realism.
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
Survive for 10 minutes on any official map in Versus Survival.
On the concert finale, survive until the helicopter arrives without leaving the stage
Earn a gold medal on any official survival map.
Earn a silver medal on any official survival map.
Destroy a Tank's rock in mid-air.
Kill 20 Jockeys with the shovel or pitchfork.
Kill a Witch using only a sharp melee weapon, without anyone getting incapacitated or killed.
Kill the Witch bride with a single shotgun blast on expert difficulty.
Find the golden crowbars hidden in the Left 4 Dead 1 survival maps.
Rescue three Survivors from a single rescue closet.
Kill a pouncing Hunter with a shotgun.
Discover the hidden room in the Last Stand campaign
With a sharp melee weapon, cut a Smoker's tongue before he ensnares you.
Earn a bronze medal on any official Survival map.
Complete The Last Stand campaign in 13 minutes or less, without any Survivors dying.
Escape Liberty Mall's Atrium before the first Tank appears
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.
As the Hunter, land a 25 damage pounce.
Destroy 20 gascans as the Spitter.
Revive an incapacitated teammate while a Tank is nearby.
Instantly kill a Survivor as the Charger.
As the Boomer, vomit on a Survivor without having direct line of sight with them.
Survive The Last Stand campaign on any difficulty.
If you are reading this achievement, Gabe Newell has successfully launched Gnome Chompski into space.