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