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