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.
As the Charger, bowl through the entire enemy team in a single charge.
Win a game of Scavenge.
Plays games with free weekend players and helps them survive a campaign.
Kill 15 Infected with a single grenade launcher blast.
Survive all campaigns on Expert.
Prove you are stronger than Moustachio.
Finish a campaign using only melee weapons.
Defend yourself at the crashed airliner without taking damage.
As the Spitter, spit on a Survivor being choked by a Smoker.
As the Charger, grab a Survivor and carry them over 80 feet.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
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.
Kill 10 swampy Mudmen while they are in the water.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
Survive the Dead Center campaign.
Survive the Hard Rain campaign.
Survive the Swamp Fever campaign.
As the Charger, grab a Survivor and smash them into the ground for a solid 15 seconds.
Prove you are faster than Moustachio.
Revive 10 dead Survivors with the defibrillator.
Cross the bridge finale in less than three minutes.
In a Survival round, get a medal only using melee weapons.
Kill a Charger with a melee weapon while they are charging.
Kill a Tank with melee weapons.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
As the Jockey, ride the Survivors twice in a single life.
Kill 100 Common Infected with the chainsaw.
Use every melee weapon to kill Common Infected.
Ignite 50 Common Infected with incendiary ammo.
Decapitate 200 Infected with a melee weapon.
As the Spitter, hit every Survivor with a single acid patch.
Kill one of each Uncommon Infected.
As the Jockey, ride a Survivor for more than 12 seconds.
Use a bile bomb on a Tank.
As the Jockey, ride a Survivor and steer them into a Spitter's acid patch.
Spread cheer by helping a free holiday player survive a campaign.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
Survive the Parish campaign.
Survive the Dark Carnival campaign.
Rescue Gnome Chompski from the Carnival.
Honk the noses of 10 Clowns.
Deploy an ammo upgrade and have your team use it.
Kill a Spitter before she is able to spit.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
Survive a campaign on Expert skill with Realism mode enabled.
Form a team and beat an enemy team in 4v4 Versus or Scavenge.
Collect 100 gas cans in Scavenge.
Collect 15 gas cans in a single Scavenge round.
Stop the enemy team from collecting any gas cans during a Scavenge round.
Make a Survivor drop a gas can during overtime.
Cause 25 gas can drops as a Special Infected.
Play 6 Mutations.
Kill a Tank only with damage from the original Survivors.
Knock off the heads of 18 infected with the golf club.
Open 5 foot lockers.
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 the new Midnight Riders song on a jukebox.
As the Charger, grab a Survivor and crash them through 8 chairs at the wedding.
Play 5 full games of Scavenge on The Port.
Have all 3 generators running at once in "The Sacrifice" finale.
Have Bill sacrifice himself for the team.
Kill a Special Infected with an exploding barrel.
Complete "The Sacrifice".
As a Special Infected, incap someone who is trying to sacrifice themselves.
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.
Survive for 10 minutes on any official map in Versus Survival.
Earn a gold medal on every official survival map.
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!
As the Boomer, vomit on a Survivor without having direct line of sight with them.
As the Spitter, spit on a Survivor who is pinned by a Charger.
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.
Kill 20 Jockeys with the shovel or pitchfork.
Earn a gold medal on any official survival map.
Escape Liberty Mall's Atrium before the first Tank appears
Kill a Witch using only a sharp melee weapon, without anyone getting incapacitated or killed.
Find the golden crowbars hidden in the Left 4 Dead 1 survival maps.
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.
Rescue three Survivors from a single rescue closet.
On the concert finale, survive until the helicopter arrives without leaving the stage
Destroy a Tank's rock in mid-air.
Complete The Last Stand campaign in 13 minutes or less, without any Survivors dying.
Earn a silver medal on any official survival map.
Earn a bronze medal on any official Survival map.
Discover the hidden room in the Last Stand campaign
Kill a pouncing Hunter with a shotgun.
Revive an incapacitated teammate while a Tank is nearby.
Survive The Last Stand campaign on any difficulty.
Survive The Last Stand campaign on Expert Realism.
Destroy 20 gascans as the Spitter.
Instantly kill a Survivor as the Charger.
As the Hunter, land a 25 damage pounce.
If you are reading this achievement, Gabe Newell has successfully launched Gnome Chompski into space.