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.
Cause 25 gas can drops as a Special Infected.
Form a team and beat an enemy team in 4v4 Versus or Scavenge.
Make a Survivor drop a gas can during overtime.
Win a game of Scavenge.
Stop the enemy team from collecting any gas cans during a Scavenge round.
As the Jockey, ride the Survivors twice in a single life.
As the Charger, bowl through the entire enemy team in a single charge.
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 Spitter, spit on a Survivor being choked by a Smoker.
As the Charger, grab a Survivor and smash them into the ground for a solid 15 seconds.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
As the Jockey, ride a Survivor for more than 12 seconds.
As the Spitter, hit every Survivor with a single acid patch.
Collect 100 gas cans in Scavenge.
Collect 15 gas cans in a single Scavenge round.
In a Survival round, get a medal only using melee weapons.
Survive all campaigns on Expert.
Kill a Charger with a melee weapon while they are charging.
Defend yourself at the crashed airliner without taking damage.
Survive a campaign on Expert skill with Realism mode enabled.
Cross the bridge finale in less than three minutes.
Revive 10 dead Survivors with the defibrillator.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
Kill 15 Infected with a single grenade launcher blast.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
Kill a Tank with melee weapons.
Navigate the sugar mill and reach the safe room without killing any Witches.
Navigate the impound lot and reach the cemetery safe room without tripping any alarms.
Rescue Gnome Chompski from the Carnival.
Honk the noses of 10 Clowns.
Prove you are faster than Moustachio.
Prove you are stronger than Moustachio.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
Finish a campaign using only melee weapons.
Ignite 50 Common Infected with incendiary ammo.
Kill 10 swampy Mudmen while they are in the water.
Survive the Parish campaign.
Decapitate 200 Infected with a melee weapon.
Use every melee weapon to kill Common Infected.
Survive the Hard Rain campaign.
Survive the Swamp Fever campaign.
Kill 100 Common Infected with the chainsaw.
Kill one of each Uncommon Infected.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
Survive the Dark Carnival campaign.
Use a bile bomb on a Tank.
Kill a Spitter before she is able to spit.
Survive the Dead Center campaign.
Deploy an ammo upgrade and have your team use it.
Spread cheer by helping a free holiday player survive a campaign.
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 6 Mutations.
Using the M60, kill 25 infected without letting go of the trigger.
Kill a Tank only with damage from the original Survivors.
Open 5 foot lockers.
Collect 10 items dropped by a Fallen Survivor.
Knock off the heads of 18 infected with the golf club.
Survive The Passing Campaign.
Play the new Midnight Riders song on a jukebox.
As a Special Infected, incap someone who is trying to sacrifice themselves.
Have all 3 generators running at once in "The Sacrifice" finale.
Kill a Special Infected with an exploding barrel.
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.
Destroy 20 gascans as the Spitter.
Survive The Last Stand campaign on Expert Realism.
Earn a silver medal on every official survival map.
Earn a bronze medal on every official survival map
Survive for 30 minutes on any official survival map.
Find the golden crowbars hidden in the Left 4 Dead 1 survival maps.
Kill 20 Jockeys with the shovel or pitchfork.
Instantly kill a Survivor as the Charger.
On the concert finale, survive until the helicopter arrives without leaving the stage
As the Hunter, land a 25 damage pounce.
As the Spitter, spit on a Survivor who is pinned by a Charger.
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.
Earn a gold medal on any official survival map.
Complete The Last Stand campaign in 13 minutes or less, without any Survivors dying.
Earn a silver medal on any official survival map.
Kill a Witch using only a sharp melee weapon, without anyone getting incapacitated or killed.
Discover the hidden room in the Last Stand campaign
With a sharp melee weapon, cut a Smoker's tongue before he ensnares you.
Rescue three Survivors from a single rescue closet.
Kill the Witch bride with a single shotgun blast on expert difficulty.
Revive an incapacitated teammate while a Tank is nearby.
Earn a bronze medal on any official Survival map.
Survive The Last Stand campaign on any difficulty.
Destroy a Tank's rock in mid-air.
Kill a pouncing Hunter with a shotgun.
Survive for 10 minutes on any official map in Versus Survival.
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.
If you are reading this achievement, Gabe Newell has successfully launched Gnome Chompski into space.