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.
Spread cheer by helping a free holiday player survive a campaign.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
Cause 25 gas can drops as a Special Infected.
Make a Survivor drop a gas can during overtime.
Survive a campaign on Expert skill with Realism mode enabled.
Survive all campaigns on Expert.
As the Jockey, ride a Survivor and steer them into a Spitter's acid patch.
In a Survival round, get a medal only using melee weapons.
Form a team and beat an enemy team in 4v4 Versus or Scavenge.
As the Spitter, spit on a Survivor being choked by a Smoker.
As the Charger, grab a Survivor and carry them over 80 feet.
Collect 100 gas cans in Scavenge.
Collect 15 gas cans in a single Scavenge round.
Win a game of Scavenge.
Stop the enemy team from collecting any gas cans during a Scavenge round.
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 Jockey, ride a Survivor for more than 12 seconds.
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.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
Rescue Gnome Chompski from the Carnival.
Cross the bridge finale in less than three minutes.
Revive 10 dead Survivors with the defibrillator.
Navigate the sugar mill and reach the safe room without killing any Witches.
Kill a Charger with a melee weapon while they are charging.
Kill 15 Infected with a single grenade launcher blast.
Ignite 50 Common Infected with incendiary ammo.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
Navigate the impound lot and reach the cemetery safe room without tripping any alarms.
Prove you are faster than Moustachio.
Defend yourself at the crashed airliner without taking damage.
Kill 10 swampy Mudmen while they are in the water.
Survive the Parish campaign.
Use every melee weapon to kill Common Infected.
Survive the Hard Rain campaign.
Honk the noses of 10 Clowns.
Kill a Tank with melee weapons.
Kill 100 Common Infected with the chainsaw.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
Survive the Swamp Fever campaign.
Kill one of each Uncommon Infected.
Survive the Dark Carnival campaign.
Prove you are stronger than Moustachio.
Deploy an ammo upgrade and have your team use it.
Finish a campaign using only melee weapons.
Kill a Spitter before she is able to spit.
Decapitate 200 Infected with a melee weapon.
Survive the Dead Center campaign.
Use a bile bomb on a Tank.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
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.
Collect 10 items dropped by a Fallen Survivor.
Open 5 foot lockers.
Using the M60, kill 25 infected without letting go of the trigger.
Kill a Tank only with damage from the original Survivors.
Play the new Midnight Riders song on a jukebox.
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.
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.
Earn a gold medal on every official survival map.
Earn a silver medal on every official survival map.
Kill 53,599 infected. You made sure the dead won't rise anymore!
Earn a bronze medal on every official survival map
Survive for 30 minutes on any official survival map.
As the Hunter, land a 25 damage pounce.
On the concert finale, survive until the helicopter arrives without leaving the stage
Instantly kill a Survivor as the Charger.
Destroy 20 gascans as the Spitter.
As the Spitter, spit on a Survivor who is pinned by a Hunter.
Survive for 10 minutes on any official map in Versus Survival.
Rescue three Survivors from a single rescue closet.
Escape Liberty Mall's Atrium before the first Tank appears
Complete The Last Stand campaign in 13 minutes or less, without any Survivors dying.
As the Spitter, spit on a Survivor who is pinned by a Charger.
As the Boomer, vomit on a Survivor without having direct line of sight with them.
Survive The Last Stand campaign on Expert Realism.
Find the golden crowbars hidden in the Left 4 Dead 1 survival maps.
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.
Destroy a Tank's rock in mid-air.
Kill a pouncing Hunter with a shotgun.
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.
Survive The Last Stand campaign on any difficulty.
Revive an incapacitated teammate while a Tank is nearby.
With a sharp melee weapon, cut a Smoker's tongue before he ensnares you.
Kill 20 Jockeys with the shovel or pitchfork.
Discover the hidden room in the Last Stand campaign
If you are reading this achievement, Gabe Newell has successfully launched Gnome Chompski into space.