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.
Survive a campaign on Expert skill with Realism mode enabled.
Survive all campaigns on Expert.
Spread cheer by helping a free holiday player survive a campaign.
Collect 100 gas cans in Scavenge.
Cause 25 gas can drops as a Special Infected.
Make a Survivor drop a gas can during overtime.
Collect 15 gas cans in a single Scavenge round.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
Defend yourself at the crashed airliner without taking damage.
Revive 10 dead Survivors with the defibrillator.
In a Survival round, get a medal only using melee weapons.
Finish a campaign using only melee weapons.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
Kill a Tank with melee weapons.
Kill a Charger with a melee weapon while they are charging.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
Form a team and beat an enemy team in 4v4 Versus or Scavenge.
Win a game of Scavenge.
As the Charger, bowl through the entire enemy team in a single charge.
Stop the enemy team from collecting any gas cans during a Scavenge round.
As the Charger, grab a Survivor and carry them over 80 feet.
As the Charger, grab a Survivor and smash them into the ground for a solid 15 seconds.
As the Jockey, ride the Survivors twice in a single life.
As the Spitter, spit on a Survivor being choked by a Smoker.
As the Jockey, ride a Survivor for more than 12 seconds.
As the Jockey, ride a Survivor and steer them into a Spitter's acid patch.
As the Spitter, hit every Survivor with a single acid patch.
Ignite 50 Common Infected with incendiary ammo.
Kill 10 swampy Mudmen while they are in the water.
Survive the Dark Carnival campaign.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
Use a bile bomb on a Tank.
Honk the noses of 10 Clowns.
Cross the bridge finale in less than three minutes.
Survive the Parish campaign.
Kill 15 Infected with a single grenade launcher blast.
Decapitate 200 Infected with a melee weapon.
Navigate the impound lot and reach the cemetery safe room without tripping any alarms.
Use every melee weapon to kill Common Infected.
Survive the Hard Rain campaign.
Kill 100 Common Infected with the chainsaw.
Navigate the sugar mill and reach the safe room without killing any Witches.
Survive the Swamp Fever campaign.
Rescue Gnome Chompski from the Carnival.
Prove you are faster than Moustachio.
Prove you are stronger than Moustachio.
Kill one of each Uncommon Infected.
Survive the Dead Center campaign.
Deploy an ammo upgrade and have your team use it.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
Kill a Spitter before she is able to spit.
Plays games with free weekend players and helps them survive a campaign.
Collect 10 items dropped by a Fallen Survivor.
Kill a Tank only with damage from the original Survivors.
Play 6 Mutations.
Play 5 full games of Scavenge on The Port.
Play the new Midnight Riders song on a jukebox.
Open 5 foot lockers.
Knock off the heads of 18 infected with the golf club.
Using the M60, kill 25 infected without letting go of the trigger.
As the Charger, grab a Survivor and crash them through 8 chairs at the wedding.
Survive The Passing Campaign.
Have all 3 generators running at once in "The Sacrifice" finale.
Kill a Special Infected with an exploding barrel.
As a Special Infected, incap someone who is trying to sacrifice themselves.
Have Bill sacrifice himself for the team.
Complete "The Sacrifice".
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 The Last Stand campaign on Expert Realism.
Kill the Witch bride with a single shotgun blast on expert difficulty.
Complete The Last Stand campaign in 13 minutes or less, without any Survivors dying.
Earn a gold medal on every official survival map.
On the concert finale, survive until the helicopter arrives without leaving the stage
Escape Liberty Mall's Atrium before the first Tank appears
Discover the hidden room in the Last Stand campaign
Destroy 20 gascans as the Spitter.
Survive for 10 minutes on any official map in Versus Survival.
Earn a bronze medal on every official survival map
Earn a silver medal on every official survival map.
Find the golden crowbars hidden in the Left 4 Dead 1 survival maps.
Survive for 30 minutes on any official survival map.
Earn a gold medal on any official survival map.
Rescue three Survivors from a single rescue closet.
Kill a Witch using only a sharp melee weapon, without anyone getting incapacitated or killed.
Kill 20 Jockeys with the shovel or pitchfork.
Earn a silver medal on any official survival map.
Earn a bronze medal on any official Survival map.
Instantly kill a Survivor as the Charger.
As the Spitter, spit on a Survivor who is pinned by a Hunter.
As the Hunter, land a 25 damage pounce.
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 any difficulty.
Destroy a Tank's rock in mid-air.
With a sharp melee weapon, cut a Smoker's tongue before he ensnares you.
Kill a pouncing Hunter with a shotgun.
Revive an incapacitated teammate while a Tank is nearby.
Kill 53,599 infected. You made sure the dead won't rise anymore!
If you are reading this achievement, Gabe Newell has successfully launched Gnome Chompski into space.