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.
Revive 10 dead Survivors with the defibrillator.
Cause 25 gas can drops as a Special Infected.
Survive all campaigns on Expert.
Survive a campaign on Expert skill with Realism mode enabled.
Collect 100 gas cans in Scavenge.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
Defend yourself at the crashed airliner without taking damage.
Kill a Charger with a melee weapon while they are charging.
Make a Survivor drop a gas can during overtime.
As the Spitter, spit on a Survivor being choked by a Smoker.
As the Jockey, ride the Survivors twice in a single life.
As the Jockey, ride a Survivor for more than 12 seconds.
In a Survival round, get a medal only using melee weapons.
Navigate the sugar mill and reach the safe room without killing any Witches.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
Spread cheer by helping a free holiday player survive a campaign.
Form a team and beat an enemy team in 4v4 Versus or Scavenge.
Stop the enemy team from collecting any gas cans during a Scavenge round.
Kill 15 Infected with a single grenade launcher blast.
As the Charger, bowl through the entire enemy team in a single charge.
Kill 10 swampy Mudmen while they are in the water.
Ignite 50 Common Infected with incendiary ammo.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
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.
Kill a Tank with melee weapons.
Kill 100 Common Infected with the chainsaw.
Use every melee weapon to kill Common Infected.
As the Jockey, ride a Survivor and steer them into a Spitter's acid patch.
Finish a campaign using only melee weapons.
Survive the Hard Rain campaign.
As the Spitter, hit every Survivor with a single acid patch.
Win a game of Scavenge.
As the Charger, grab a Survivor and smash them into the ground for a solid 15 seconds.
Collect 15 gas cans in a single Scavenge round.
Survive the Swamp Fever campaign.
Kill one of each Uncommon Infected.
Prove you are stronger than Moustachio.
Survive the Dark Carnival campaign.
Rescue Gnome Chompski from the Carnival.
Decapitate 200 Infected with a melee weapon.
Prove you are faster than Moustachio.
Honk the noses of 10 Clowns.
As the Charger, grab a Survivor and carry them over 80 feet.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
Deploy an ammo upgrade and have your team use it.
Survive the Dead Center campaign.
Use a bile bomb on a Tank.
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.
Play 5 full games of Scavenge on The Port.
Kill a Tank only with damage from the original Survivors.
Play the new Midnight Riders song on a jukebox.
Collect 10 items dropped by a Fallen Survivor.
Open 5 foot lockers.
Using the M60, kill 25 infected without letting go of the trigger.
Survive The Passing Campaign.
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.
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.
Kill the Witch bride with a single shotgun blast on expert difficulty.
Destroy a Tank's rock in mid-air.
Kill a Witch using only a sharp melee weapon, without anyone getting incapacitated or killed.
Escape Liberty Mall's Atrium before the first Tank appears
Instantly kill a Survivor as the Charger.
Kill 20 Jockeys with the shovel or pitchfork.
Discover the hidden room in the Last Stand campaign
Survive The Last Stand campaign on Expert Realism.
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
With a sharp melee weapon, cut a Smoker's tongue before he ensnares you.
Survive for 30 minutes on any official survival map.
Rescue three Survivors from a single rescue closet.
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
As the Boomer, vomit on a Survivor without having direct line of sight with them.
As the Hunter, land a 25 damage pounce.
Survive for 10 minutes on any official map in Versus Survival.
Kill a pouncing Hunter with a shotgun.
Find the golden crowbars hidden in the Left 4 Dead 1 survival maps.
Revive an incapacitated teammate while a Tank is nearby.
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.
As the Spitter, spit on a Survivor who is pinned by a Charger.
As the Spitter, spit on a Survivor who is pinned by a Hunter.
Survive The Last Stand campaign on any difficulty.
If you are reading this achievement, Gabe Newell has successfully launched Gnome Chompski into space.