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.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
Survive a campaign on Expert skill with Realism mode enabled.
Cause 25 gas can drops as a Special Infected.
Make a Survivor drop a gas can during overtime.
Collect 100 gas cans in Scavenge.
As the Charger, grab a Survivor and carry them over 80 feet.
Survive all campaigns on Expert.
Defend yourself at the crashed airliner without taking damage.
Cross the bridge finale in less than three minutes.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
In a Survival round, get a medal only using melee weapons.
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.
As the Charger, bowl through the entire enemy team in a single charge.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
Form a team and beat an enemy team in 4v4 Versus or Scavenge.
Kill a Tank with melee weapons.
Kill a Charger with a melee weapon while they are charging.
As the Spitter, hit every Survivor with a single acid patch.
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.
Rescue Gnome Chompski from the Carnival.
Prove you are stronger than Moustachio.
Honk the noses of 10 Clowns.
Finish a campaign using only melee weapons.
Win a game of Scavenge.
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.
Revive 10 dead Survivors with the defibrillator.
Kill 10 swampy Mudmen while they are in the water.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
Spread cheer by helping a free holiday player survive a campaign.
Prove you are faster than Moustachio.
Use a bile bomb on a Tank.
Kill 15 Infected with a single grenade launcher blast.
Ignite 50 Common Infected with incendiary ammo.
Kill a Spitter before she is able to spit.
Stop the enemy team from collecting any gas cans during a Scavenge round.
As the Jockey, ride a Survivor for more than 12 seconds.
Collect 15 gas cans in a single Scavenge round.
Survive the Parish campaign.
Use every melee weapon to kill Common Infected.
Survive the Hard Rain campaign.
Deploy an ammo upgrade and have your team use it.
Survive the Swamp Fever campaign.
Kill 100 Common Infected with the chainsaw.
Kill one of each Uncommon Infected.
Survive the Dark Carnival campaign.
Survive the Dead Center campaign.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
Decapitate 200 Infected with a melee weapon.
Collect 10 items dropped by a Fallen Survivor.
As the Charger, grab a Survivor and crash them through 8 chairs at the wedding.
Play 5 full games of Scavenge on The Port.
Play 6 Mutations.
Using the M60, kill 25 infected without letting go of the trigger.
Open 5 foot lockers.
Play the new Midnight Riders song on a jukebox.
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.
As a Special Infected, incap someone who is trying to sacrifice themselves.
Have all 3 generators running at once in "The Sacrifice" finale.
Kill a Special Infected with an exploding barrel.
Complete "The Sacrifice".
Have Bill sacrifice himself for the team.
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.
Instantly kill a Survivor as the Charger.
As the Hunter, land a 25 damage pounce.
As the Boomer, vomit on a Survivor without having direct line of sight with them.
As the Spitter, spit on a Survivor who is pinned by a Hunter.
As the Spitter, spit on a Survivor who is pinned by a Charger.
Rescue three Survivors from a single rescue closet.
Kill the Witch bride with a single shotgun blast on expert difficulty.
On the concert finale, survive until the helicopter arrives without leaving the stage
Escape Liberty Mall's Atrium before the first Tank appears
Complete The Last Stand campaign in 13 minutes or less, without any Survivors dying.
Survive The Last Stand campaign on any difficulty.
Survive The Last Stand campaign on Expert Realism.
Discover the hidden room in the Last Stand campaign
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
Find the golden crowbars hidden in the Left 4 Dead 1 survival maps.
Kill 20 Jockeys with the shovel or pitchfork.
With a sharp melee weapon, cut a Smoker's tongue before he ensnares you.
Survive for 30 minutes on any official survival map.
Kill a pouncing Hunter with a shotgun.
Kill a Witch using only a sharp melee weapon, without anyone getting incapacitated or killed.
Destroy a Tank's rock in mid-air.
Survive for 10 minutes on any official map in Versus Survival.
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.
Revive an incapacitated teammate while a Tank is nearby.
If you are reading this achievement, Gabe Newell has successfully launched Gnome Chompski into space.