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.
Survive all campaigns on Expert.
Make a Survivor drop a gas can during overtime.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
Navigate the impound lot and reach the cemetery safe room without tripping any alarms.
Navigate the sugar mill and reach the safe room without killing any Witches.
Revive 10 dead Survivors with the defibrillator.
Survive a campaign on Expert skill with Realism mode enabled.
Rescue Gnome Chompski from the Carnival.
Cause 25 gas can drops as a Special Infected.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
Survive the Swamp Fever campaign.
Defend yourself at the crashed airliner without taking damage.
In a Survival round, get a medal only using melee weapons.
Collect 100 gas cans in Scavenge.
As the Spitter, spit on a Survivor being choked by a Smoker.
Form a team and beat an enemy team in 4v4 Versus or Scavenge.
As the Charger, bowl through the entire enemy team in a single charge.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
Ignite 50 Common Infected with incendiary ammo.
Kill a Charger with a melee weapon while they are charging.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
Prove you are faster than Moustachio.
Prove you are stronger than Moustachio.
Kill 15 Infected with a single grenade launcher blast.
Honk the noses of 10 Clowns.
Survive the Hard Rain campaign.
Spread cheer by helping a free holiday player survive a campaign.
Plays games with free weekend players and helps them survive a campaign.
Kill 10 swampy Mudmen while they are in the water.
Deploy an ammo upgrade and have your team use it.
As the Charger, grab a Survivor and smash them into the ground for a solid 15 seconds.
Kill one of each Uncommon Infected.
Finish a campaign using only melee weapons.
Cross the bridge finale in less than three minutes.
Survive the Parish campaign.
Kill a Tank with melee weapons.
Kill 100 Common Infected with the chainsaw.
Use every melee weapon to kill Common Infected.
Decapitate 200 Infected with a melee weapon.
As the Charger, grab a Survivor and carry them over 80 feet.
Stop the enemy team from collecting any gas cans during a Scavenge round.
Win a game of Scavenge.
As the Jockey, ride a Survivor and steer them into a Spitter's acid patch.
Collect 15 gas cans in a single Scavenge round.
As the Jockey, ride a Survivor for more than 12 seconds.
Use a bile bomb on a Tank.
Survive the Dark Carnival campaign.
Survive the Dead Center campaign.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
As the Spitter, hit every Survivor with a single acid patch.
As the Jockey, ride the Survivors twice in a single life.
Kill a Spitter before she is able to spit.
As the Charger, grab a Survivor and crash them through 8 chairs at the wedding.
Play 6 Mutations.
Kill a Tank only with damage from the original Survivors.
Collect 10 items dropped by a Fallen Survivor.
Using the M60, kill 25 infected without letting go of the trigger.
Survive The Passing Campaign.
Play 5 full games of Scavenge on The Port.
Open 5 foot lockers.
Play the new Midnight Riders song on a jukebox.
Knock off the heads of 18 infected with the golf club.
As a Special Infected, incap someone who is trying to sacrifice themselves.
Complete "The Sacrifice".
Have Bill sacrifice himself for the team.
Have all 3 generators running at once in "The Sacrifice" finale.
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.
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.
Kill 53,599 infected. You made sure the dead won't rise anymore!
Survive for 10 minutes on any official map in Versus Survival.
As the Hunter, land a 25 damage pounce.
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
Survive for 30 minutes on any official survival map.
As the Boomer, vomit on a Survivor without having direct line of sight with them.
Instantly kill a Survivor as the Charger.
Find the golden crowbars hidden in the Left 4 Dead 1 survival maps.
Complete The Last Stand campaign in 13 minutes or less, without any Survivors dying.
Escape Liberty Mall's Atrium before the first Tank appears
On the concert finale, survive until the helicopter arrives without leaving the stage
Kill the Witch bride with a single shotgun blast on expert difficulty.
Rescue three Survivors from a single rescue closet.
Revive an incapacitated teammate while a Tank is nearby.
Kill a pouncing Hunter with a shotgun.
With a sharp melee weapon, cut a Smoker's tongue before he ensnares you.
Discover the hidden room in the Last Stand campaign
Kill a Witch using only a sharp melee weapon, without anyone getting incapacitated or killed.
Kill 20 Jockeys with the shovel or pitchfork.
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 Expert Realism.
Survive The Last Stand campaign on any difficulty.
Destroy a Tank's rock in mid-air.
Destroy 20 gascans as the Spitter.
If you are reading this achievement, Gabe Newell has successfully launched Gnome Chompski into space.