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