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