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