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.
Plays games with free weekend players and helps them survive a campaign.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
Cause 25 gas can drops as a Special Infected.
Make a Survivor drop a gas can during overtime.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
As the Charger, bowl through the entire enemy team in a single charge.
Form a team and beat an enemy team in 4v4 Versus or Scavenge.
Stop the enemy team from collecting any gas cans during a Scavenge round.
Cross the bridge finale in less than three minutes.
Kill 15 Infected with a single grenade launcher blast.
As the Charger, grab a Survivor and carry them over 80 feet.
Survive all campaigns on Expert.
Survive the Parish campaign.
Collect 100 gas cans in Scavenge.
Prove you are stronger than Moustachio.
Rescue Gnome Chompski from the Carnival.
Prove you are faster than Moustachio.
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.
Navigate the sugar mill and reach the safe room without killing any Witches.
Kill a Charger with a melee weapon while they are charging.
Kill a Tank with melee weapons.
Win a game of Scavenge.
As the Jockey, ride the Survivors twice in a single life.
As the Jockey, ride a Survivor for more than 12 seconds.
As the Charger, grab a Survivor and smash them into the ground for a solid 15 seconds.
Collect 15 gas cans in a single Scavenge round.
Survive a campaign on Expert skill with Realism mode enabled.
In a Survival round, get a medal only using melee weapons.
As the Spitter, hit every Survivor with a single acid patch.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
Revive 10 dead Survivors with the defibrillator.
Survive the Swamp Fever campaign.
Defend yourself at the crashed airliner without taking damage.
Kill 10 swampy Mudmen while they are in the water.
Survive the Hard Rain campaign.
Survive the Dark Carnival campaign.
Use a bile bomb on a Tank.
Use every melee weapon to kill Common Infected.
Honk the noses of 10 Clowns.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
Ignite 50 Common Infected with incendiary ammo.
Kill 100 Common Infected with the chainsaw.
Spread cheer by helping a free holiday player survive a campaign.
Deploy an ammo upgrade and have your team use it.
Decapitate 200 Infected with a melee weapon.
Survive the Dead Center campaign.
Finish a campaign using only melee weapons.
Kill a Spitter before she is able to spit.
Kill one of each Uncommon Infected.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
Navigate the impound lot and reach the cemetery safe room without tripping any alarms.
Play 5 full games of Scavenge on The Port.
As the Charger, grab a Survivor and crash them through 8 chairs at the wedding.
Open 5 foot lockers.
Using the M60, kill 25 infected without letting go of the trigger.
Knock off the heads of 18 infected with the golf club.
Kill a Tank only with damage from the original Survivors.
Play 6 Mutations.
Survive The Passing Campaign.
Play the new Midnight Riders song on a jukebox.
Collect 10 items dropped by a Fallen Survivor.
As a Special Infected, incap someone who is trying to sacrifice themselves.
Have all 3 generators running at once in "The Sacrifice" finale.
Complete "The Sacrifice".
Kill a Special Infected with an exploding barrel.
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.
Find the golden crowbars hidden in the Left 4 Dead 1 survival maps.
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 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 30 minutes on any official survival map.
As the Hunter, land a 25 damage pounce.
As the Spitter, spit on a Survivor who is pinned by a Charger.
Instantly kill a Survivor as the Charger.
Escape Liberty Mall's Atrium before the first Tank appears
Discover the hidden room in the Last Stand campaign
Rescue three Survivors from a single rescue closet.
On the concert finale, survive until the helicopter arrives without leaving the stage
Kill a Witch using only a sharp melee weapon, without anyone getting incapacitated or killed.
Destroy 20 gascans as the Spitter.
Complete The Last Stand campaign in 13 minutes or less, without any Survivors dying.
Kill 20 Jockeys with the shovel or pitchfork.
Kill a pouncing Hunter with a shotgun.
Destroy a Tank's rock in mid-air.
With a sharp melee weapon, cut a Smoker's tongue before he ensnares you.
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.
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.
Survive The Last Stand campaign on any difficulty.
Revive an incapacitated teammate while a Tank is nearby.
As the Boomer, vomit on a Survivor without having direct line of sight with them.
If you are reading this achievement, Gabe Newell has successfully launched Gnome Chompski into space.