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.
Spread cheer by helping a free holiday player survive a campaign.
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.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
Kill a Charger with a melee weapon while they are charging.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
As the Charger, bowl through the entire enemy team in a single charge.
As the Charger, grab a Survivor and carry them over 80 feet.
As the Jockey, ride a Survivor and steer them into a Spitter's acid patch.
Survive a campaign on Expert skill with Realism mode enabled.
Survive all campaigns on Expert.
Cross the bridge finale in less than three minutes.
Revive 10 dead Survivors with the defibrillator.
Defend yourself at the crashed airliner without taking damage.
Rescue Gnome Chompski from the Carnival.
Honk the noses of 10 Clowns.
Kill 10 swampy Mudmen while they are in the water.
Survive the Swamp Fever campaign.
Kill 15 Infected with a single grenade launcher blast.
Cause 25 gas can drops as a Special Infected.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
Collect 100 gas cans in Scavenge.
Survive the Dark Carnival campaign.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
Finish a campaign using only melee weapons.
Survive the Parish campaign.
Prove you are faster than Moustachio.
Ignite 50 Common Infected with incendiary ammo.
Navigate the impound lot and reach the cemetery safe room without tripping any alarms.
Use every melee weapon to kill Common Infected.
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.
Decapitate 200 Infected with a melee weapon.
Deploy an ammo upgrade and have your team use it.
Kill 100 Common Infected with the chainsaw.
Survive the Dead Center campaign.
Survive the Hard Rain campaign.
Navigate the sugar mill and reach the safe room without killing any Witches.
Make a Survivor drop a gas can during overtime.
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.
As the Jockey, ride a Survivor for more than 12 seconds.
As the Jockey, ride the Survivors twice in a single life.
Win a game of Scavenge.
Collect 15 gas cans in a single Scavenge round.
Stop the enemy team from collecting any gas cans during a Scavenge round.
Use a bile bomb on a Tank.
Kill a Tank with melee weapons.
As the Spitter, hit every Survivor with a single acid patch.
As the Spitter, spit on a Survivor being choked by a Smoker.
Prove you are stronger than Moustachio.
Play 6 Mutations.
As the Charger, grab a Survivor and crash them through 8 chairs at the wedding.
Using the M60, kill 25 infected without letting go of the trigger.
Survive The Passing Campaign.
Collect 10 items dropped by a Fallen Survivor.
Knock off the heads of 18 infected with the golf club.
Play the new Midnight Riders song on a jukebox.
Kill a Tank only with damage from the original Survivors.
Open 5 foot lockers.
Play 5 full games of Scavenge on The Port.
As a Special Infected, incap someone who is trying to sacrifice themselves.
Kill a Special Infected with an exploding barrel.
Complete "The Sacrifice".
Have Bill sacrifice himself for the team.
Have all 3 generators running at once in "The Sacrifice" finale.
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!
Survive for 10 minutes on any official map in Versus Survival.
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 20 Jockeys with the shovel or pitchfork.
As the Hunter, land a 25 damage pounce.
Survive for 30 minutes on any official survival map.
Kill a Witch using only a sharp melee weapon, without anyone getting incapacitated or killed.
With a sharp melee weapon, cut a Smoker's tongue before he ensnares you.
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.
Kill a pouncing Hunter with a shotgun.
Rescue three Survivors from a single rescue closet.
On the concert finale, survive until the helicopter arrives without leaving the stage
Survive The Last Stand campaign on any difficulty.
Survive The Last Stand campaign on Expert Realism.
Escape Liberty Mall's Atrium before the first Tank appears
Destroy a Tank's rock in mid-air.
Earn a gold medal on any official survival map.
As the Spitter, spit on a Survivor who is pinned by a Charger.
Destroy 20 gascans as the Spitter.
Instantly kill a Survivor as the Charger.
Earn a silver medal on any official survival map.
Earn a bronze medal on any official Survival map.
As the Spitter, spit on a Survivor who is pinned by a Hunter.
As the Boomer, vomit on a Survivor without having direct line of sight with them.
Revive an incapacitated teammate while a Tank is nearby.
Discover the hidden room in the Last Stand campaign
If you are reading this achievement, Gabe Newell has successfully launched Gnome Chompski into space.