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