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.
Survive all campaigns on Expert.
Survive a campaign on Expert skill with Realism mode enabled.
Kill a Tank with melee weapons.
Make a Survivor drop a gas can during overtime.
Form a team and beat an enemy team in 4v4 Versus or Scavenge.
Cause 25 gas can drops as a Special Infected.
Defend yourself at the crashed airliner without taking damage.
Spread cheer by helping a free holiday player survive a campaign.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
Ignite 50 Common Infected with incendiary ammo.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
As the Charger, bowl through the entire enemy team in a single charge.
As the Jockey, ride a Survivor and steer them into a Spitter's acid patch.
Navigate the sugar mill and reach the safe room without killing any Witches.
Navigate the impound lot and reach the cemetery safe room without tripping any alarms.
Honk the noses of 10 Clowns.
In a Survival round, get a medal only using melee weapons.
Cross the bridge finale in less than three minutes.
Prove you are faster than Moustachio.
Prove you are stronger than Moustachio.
Kill 15 Infected with a single grenade launcher blast.
Deploy an ammo upgrade and have your team use it.
Rescue Gnome Chompski from the Carnival.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
As the Spitter, spit on a Survivor being choked by a Smoker.
Collect 100 gas cans in Scavenge.
As the Charger, grab a Survivor and carry them over 80 feet.
As the Jockey, ride the Survivors twice in a single life.
Stop the enemy team from collecting any gas cans during a Scavenge round.
Win a game of Scavenge.
As the Spitter, hit every Survivor with a single acid patch.
Collect 15 gas cans in a single Scavenge round.
As the Charger, grab a Survivor and smash them into the ground for a solid 15 seconds.
As the Jockey, ride a Survivor for more than 12 seconds.
Use a bile bomb on a Tank.
Survive the Parish campaign.
Kill 100 Common Infected with the chainsaw.
Decapitate 200 Infected with a melee weapon.
Kill a Charger with a melee weapon while they are charging.
Use every melee weapon to kill Common Infected.
Survive the Hard Rain campaign.
Kill one of each Uncommon Infected.
Survive the Swamp Fever campaign.
Kill 10 swampy Mudmen while they are in the water.
Survive the Dark Carnival campaign.
Kill a Spitter before she is able to spit.
Survive the Dead Center campaign.
Finish a campaign using only melee weapons.
Kill a Jockey within 2 seconds of it jumping on a 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.
Collect 10 items dropped by a Fallen Survivor.
Kill a Tank only with damage from the original Survivors.
Play the new Midnight Riders song on a jukebox.
Open 5 foot lockers.
Knock off the heads of 18 infected with the golf club.
Survive The Passing Campaign.
As a Special Infected, incap someone who is trying to sacrifice themselves.
Kill a Special Infected with an exploding barrel.
Have all 3 generators running at once in "The Sacrifice" finale.
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.
Survive for 30 minutes on any official survival map.
Survive for 10 minutes on any official map in Versus Survival.
On the concert finale, survive until the helicopter arrives without leaving the stage
Kill a pouncing Hunter with a shotgun.
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.
Survive The Last Stand campaign on Expert Realism.
Discover the hidden room in the Last Stand campaign
Rescue three Survivors from a single rescue closet.
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.
As the Hunter, land a 25 damage pounce.
As the Spitter, spit on a Survivor who is pinned by a Charger.
Destroy 20 gascans as the Spitter.
As the Spitter, spit on a Survivor who is pinned by a Hunter.
Instantly kill a Survivor as the Charger.
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
Complete The Last Stand campaign in 13 minutes or less, without any Survivors dying.
Destroy a Tank's rock in mid-air.
Survive The Last Stand campaign on any difficulty.
Revive an incapacitated teammate while a Tank is nearby.
Find the golden crowbars hidden in the Left 4 Dead 1 survival maps.
With a sharp melee weapon, cut a Smoker's tongue before he ensnares you.
Kill 20 Jockeys with the shovel or pitchfork.
Kill 53,599 infected. You made sure the dead won't rise anymore!
Earn a bronze medal on every official survival map
Earn a silver medal on every official survival map.
Earn a gold medal on every official survival map.
If you are reading this achievement, Gabe Newell has successfully launched Gnome Chompski into space.