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.
Survive a campaign on Expert skill with Realism mode enabled.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
Survive all campaigns on Expert.
Kill a Charger with a melee weapon while they are charging.
Collect 100 gas cans in Scavenge.
Cause 25 gas can drops as a Special Infected.
Collect 15 gas cans in a single Scavenge round.
Make a Survivor drop a gas can during overtime.
As the Jockey, ride a Survivor and steer them into a Spitter's acid patch.
As the Charger, grab a Survivor and carry them over 80 feet.
As the Spitter, spit on a Survivor being choked by a Smoker.
Win a game of Scavenge.
Stop the enemy team from collecting any gas cans during a Scavenge round.
Revive 10 dead Survivors with the defibrillator.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
As the Charger, bowl through the entire enemy team in a single charge.
As the Jockey, ride the Survivors twice in a single life.
As the Spitter, hit every Survivor with a single acid patch.
As the Jockey, ride a Survivor for more than 12 seconds.
In a Survival round, get a medal only using melee weapons.
Kill a Tank with melee weapons.
Defend yourself at the crashed airliner without taking damage.
Navigate the sugar mill and reach the safe room without killing any Witches.
Rescue Gnome Chompski from the Carnival.
Prove you are faster than Moustachio.
Prove you are stronger than Moustachio.
Kill 15 Infected with a single grenade launcher blast.
Spread cheer by helping a free holiday player survive a campaign.
Survive the Parish campaign.
Navigate the impound lot and reach the cemetery safe room without tripping any alarms.
Use every melee weapon to kill Common Infected.
As the Charger, grab a Survivor and smash them into the ground for a solid 15 seconds.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
Kill 10 swampy Mudmen while they are in the water.
Finish a campaign using only melee weapons.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
Honk the noses of 10 Clowns.
Cross the bridge finale in less than three minutes.
Decapitate 200 Infected with a melee weapon.
Use a bile bomb on a Tank.
Survive the Hard Rain campaign.
Survive the Swamp Fever campaign.
Survive the Dark Carnival campaign.
Ignite 50 Common Infected with incendiary ammo.
Kill a Spitter before she is able to spit.
Kill one of each Uncommon Infected.
Kill 100 Common Infected with the chainsaw.
Deploy an ammo upgrade and have your team use it.
Survive the Dead Center campaign.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
Kill a Tank only with damage from the original Survivors.
Play 6 Mutations.
Using the M60, kill 25 infected without letting go of the trigger.
Play 5 full games of Scavenge on The Port.
Collect 10 items dropped by a Fallen Survivor.
Open 5 foot lockers.
Knock off the heads of 18 infected with the golf club.
Play the new Midnight Riders song on a jukebox.
As the Charger, grab a Survivor and crash them through 8 chairs at the wedding.
Survive The Passing Campaign.
As a Special Infected, incap someone who is trying to sacrifice themselves.
Complete "The Sacrifice".
Have Bill sacrifice himself for the team.
Have all 3 generators running at once in "The Sacrifice" finale.
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!
Survive The Last Stand campaign on Expert Realism.
Survive for 30 minutes on any official survival map.
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 20 Jockeys with the shovel or pitchfork.
Kill the Witch bride with a single shotgun blast on expert difficulty.
Find the golden crowbars hidden in the Left 4 Dead 1 survival maps.
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.
As the Hunter, land a 25 damage pounce.
With a sharp melee weapon, cut a Smoker's tongue before he ensnares you.
Destroy 20 gascans as the Spitter.
As the Boomer, vomit on a Survivor without having direct line of sight with them.
Survive for 10 minutes on any official map in Versus Survival.
Instantly kill a Survivor as the Charger.
On the concert finale, survive until the helicopter arrives without leaving the stage
Escape Liberty Mall's Atrium before the first Tank appears
Earn a gold medal on any official survival map.
Kill a Witch using only a sharp melee weapon, without anyone getting incapacitated or killed.
Rescue three Survivors from a single rescue closet.
Earn a silver medal on any official survival map.
Earn a bronze medal on any official Survival map.
Revive an incapacitated teammate while a Tank is nearby.
Complete The Last Stand campaign in 13 minutes or less, without any Survivors dying.
Discover the hidden room in the Last Stand campaign
Destroy a Tank's rock in mid-air.
Survive The Last Stand campaign on any difficulty.
Kill a pouncing Hunter with a shotgun.
If you are reading this achievement, Gabe Newell has successfully launched Gnome Chompski into space.