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