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.
Stop the enemy team from collecting any gas cans during a Scavenge round.
Navigate the impound lot and reach the cemetery safe room without tripping any alarms.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
Kill a Charger with a melee weapon while they are charging.
Survive a campaign on Expert skill with Realism mode enabled.
Survive all campaigns on Expert.
Prove you are faster than Moustachio.
Form a team and beat an enemy team in 4v4 Versus or Scavenge.
Revive 10 dead Survivors with the defibrillator.
Survive the Swamp Fever campaign.
Navigate the sugar mill and reach the safe room without killing any Witches.
Collect 100 gas cans in Scavenge.
Make a Survivor drop a gas can during overtime.
Cross the bridge finale in less than three minutes.
Cause 25 gas can drops as a Special Infected.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
Defend yourself at the crashed airliner without taking damage.
Prove you are stronger than Moustachio.
Plays games with free weekend players and helps them survive a campaign.
Win a game of Scavenge.
Finish a campaign using only melee weapons.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
Rescue Gnome Chompski from the Carnival.
Kill 10 swampy Mudmen while they are in the water.
Kill 15 Infected with a single grenade launcher blast.
In a Survival round, get a medal only using melee weapons.
Collect 15 gas cans in a single Scavenge round.
Survive the Dead Center campaign.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
Survive the Parish campaign.
Kill a Tank with melee weapons.
Honk the noses of 10 Clowns.
Kill one of each Uncommon Infected.
As the Charger, bowl through the entire enemy team in a single charge.
Deploy an ammo upgrade and have your team use it.
Survive the Dark Carnival campaign.
Ignite 50 Common Infected with incendiary ammo.
Kill 100 Common Infected with the chainsaw.
As the Jockey, ride a Survivor and steer them into a Spitter's acid patch.
Decapitate 200 Infected with a melee weapon.
As the Charger, grab a Survivor and carry them over 80 feet.
Use a bile bomb on a Tank.
Survive the Hard Rain campaign.
Use every melee weapon to kill Common Infected.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
As the Jockey, ride the Survivors twice in a single life.
Kill a Spitter before she is able to spit.
As the Spitter, spit on a Survivor being choked by a Smoker.
As the Jockey, ride a Survivor for more than 12 seconds.
As the Charger, grab a Survivor and smash them into the ground for a solid 15 seconds.
As the Spitter, hit every Survivor with a single acid patch.
Using the M60, kill 25 infected without letting go of the trigger.
Play 5 full games of Scavenge on The Port.
Collect 10 items dropped by a Fallen Survivor.
Play the new Midnight Riders song on a jukebox.
As the Charger, grab a Survivor and crash them through 8 chairs at the wedding.
Play 6 Mutations.
Open 5 foot lockers.
Knock off the heads of 18 infected with the golf club.
Survive The Passing Campaign.
Kill a Tank only with damage from the original Survivors.
As a Special Infected, incap someone who is trying to sacrifice themselves.
Have Bill sacrifice himself for the team.
Kill a Special Infected with an exploding barrel.
Complete "The Sacrifice".
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.
Find the golden crowbars hidden in the Left 4 Dead 1 survival maps.
Kill 53,599 infected. You made sure the dead won't rise anymore!
Complete The Last Stand campaign in 13 minutes or less, without any Survivors dying.
Earn a gold medal on any official survival map.
Survive The Last Stand campaign on Expert Realism.
Earn a gold medal on every official survival map.
Destroy 20 gascans as the Spitter.
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.
With a sharp melee weapon, cut a Smoker's tongue before he ensnares you.
As the Hunter, land a 25 damage pounce.
Kill a Witch using only a sharp melee weapon, without anyone getting incapacitated or killed.
Kill the Witch bride with a single shotgun blast on expert difficulty.
As the Boomer, vomit on a Survivor without having direct line of sight with them.
Kill a pouncing Hunter with a shotgun.
Earn a bronze medal on any official Survival map.
Destroy a Tank's rock in mid-air.
As the Spitter, spit on a Survivor who is pinned by a Charger.
Instantly kill a Survivor as the Charger.
Kill 20 Jockeys with the shovel or pitchfork.
Escape Liberty Mall's Atrium before the first Tank appears
Survive for 10 minutes on any official map in Versus Survival.
Survive for 30 minutes on any official survival map.
Earn a silver medal on any official survival map.
As the Spitter, spit on a Survivor who is pinned by a Hunter.
Earn a silver medal on every official survival map.
Earn a bronze medal on every official survival map
Discover the hidden room in the Last Stand campaign
Revive an incapacitated teammate while a Tank is nearby.
If you are reading this achievement, Gabe Newell has successfully launched Gnome Chompski into space.