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