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