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.
Cause 25 gas can drops as a Special Infected.
As the Charger, bowl through the entire enemy team in a single charge.
Collect 100 gas cans in Scavenge.
Revive 10 dead Survivors with the defibrillator.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
Kill a Charger with a melee weapon while they are charging.
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.
As the Jockey, ride a Survivor for more than 12 seconds.
Survive all campaigns on Expert.
Cross the bridge finale in less than three minutes.
In a Survival round, get a medal only using melee weapons.
Prove you are stronger than Moustachio.
Prove you are faster than Moustachio.
Survive the Hard Rain campaign.
Rescue Gnome Chompski from the Carnival.
Kill 15 Infected with a single grenade launcher blast.
Kill 10 swampy Mudmen while they are in the water.
Form a team and beat an enemy team in 4v4 Versus or Scavenge.
Make a Survivor drop a gas can during overtime.
As the Jockey, ride the Survivors twice in a single life.
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.
Win a game of Scavenge.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
Survive the Parish campaign.
Ignite 50 Common Infected with incendiary ammo.
Survive the Swamp Fever campaign.
Deploy an ammo upgrade and have your team use it.
Survive a campaign on Expert skill with Realism mode enabled.
Decapitate 200 Infected with a melee weapon.
Navigate the sugar mill and reach the safe room without killing any Witches.
Kill a Tank with melee weapons.
Survive the Dead Center campaign.
Finish a campaign using only melee weapons.
Use a bile bomb on a Tank.
Kill 100 Common Infected with the chainsaw.
Defend yourself at the crashed airliner without taking damage.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
Stop the enemy team from collecting any gas cans during a Scavenge round.
Honk the noses of 10 Clowns.
Use every melee weapon to kill Common Infected.
Kill one of each Uncommon Infected.
Navigate the impound lot and reach the cemetery safe room without tripping any alarms.
As the Charger, grab a Survivor and carry them over 80 feet.
Collect 15 gas cans in a single Scavenge round.
Spread cheer by helping a free holiday player survive a campaign.
Survive the Dark Carnival campaign.
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.
Collect 10 items dropped by a Fallen Survivor.
Open 5 foot lockers.
Play 5 full games of Scavenge on The Port.
Kill a Tank only with damage from the original Survivors.
Using the M60, kill 25 infected without letting go of the trigger.
Survive The Passing Campaign.
Play the new Midnight Riders song on a jukebox.
Knock off the heads of 18 infected with the golf club.
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.
Kill 53,599 infected. You made sure the dead won't rise anymore!
Find the golden crowbars hidden in the Left 4 Dead 1 survival maps.
Kill a Witch using only a sharp melee weapon, without anyone getting incapacitated or killed.
Kill 20 Jockeys with the shovel or pitchfork.
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
Kill the Witch bride with a single shotgun blast on expert difficulty.
Rescue three Survivors from a single rescue closet.
Escape Liberty Mall's Atrium before the first Tank appears
On the concert finale, survive until the helicopter arrives without leaving the stage
Survive The Last Stand campaign on Expert Realism.
Complete The Last Stand campaign in 13 minutes or less, without any Survivors dying.
Survive The Last Stand campaign on any difficulty.
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.
Earn a bronze medal on any official Survival map.
Survive for 10 minutes on any official map in Versus Survival.
Destroy 20 gascans as the Spitter.
Revive an incapacitated teammate while a Tank is nearby.
Destroy a Tank's rock in mid-air.
With a sharp melee weapon, cut a Smoker's tongue before he ensnares you.
Kill a pouncing Hunter with a shotgun.
As the Hunter, land a 25 damage pounce.
Instantly kill a Survivor as the Charger.
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.
As the Boomer, vomit on a Survivor without having direct line of sight with them.
Discover the hidden room in the Last Stand campaign
If you are reading this achievement, Gabe Newell has successfully launched Gnome Chompski into space.