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