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