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