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