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.
Spread cheer by helping a free holiday player survive a campaign.
Survive a campaign on Expert skill with Realism mode enabled.
Form a team and beat an enemy team in 4v4 Versus or Scavenge.
Plays games with free weekend players and helps them survive a campaign.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
As the Charger, bowl through the entire enemy team in a single charge.
Survive all campaigns on Expert.
Collect 100 gas cans in Scavenge.
Cross the bridge finale in less than three minutes.
As the Spitter, spit on a Survivor being choked by a Smoker.
Navigate the sugar mill and reach the safe room without killing any Witches.
Defend yourself at the crashed airliner without taking damage.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
Kill 15 Infected with a single grenade launcher blast.
Rescue Gnome Chompski from the Carnival.
Revive 10 dead Survivors with the defibrillator.
Navigate the impound lot and reach the cemetery safe room without tripping any alarms.
Kill a Spitter before she is able to spit.
As the Charger, grab a Survivor and carry them over 80 feet.
In a Survival round, get a medal only using melee weapons.
Use every melee weapon to kill Common Infected.
Survive the Hard Rain campaign.
Kill one of each Uncommon Infected.
Honk the noses of 10 Clowns.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
Kill a Charger with a melee weapon while they are charging.
Finish a campaign using only melee weapons.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
Decapitate 200 Infected with a melee weapon.
Kill 10 swampy Mudmen while they are in the water.
Ignite 50 Common Infected with incendiary ammo.
Deploy an ammo upgrade and have your team use it.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
Kill 100 Common Infected with the chainsaw.
Use a bile bomb on a Tank.
Kill a Tank with melee weapons.
Survive the Dead Center campaign.
Survive the Dark Carnival campaign.
Survive the Swamp Fever campaign.
Survive the Parish campaign.
As the Jockey, ride a Survivor for more than 12 seconds.
As the Jockey, ride the Survivors twice in a single life.
As the Jockey, ride a Survivor and steer them into a Spitter's acid patch.
As the Spitter, hit every Survivor with a single acid patch.
As the Charger, grab a Survivor and smash them into the ground for a solid 15 seconds.
Win a game of Scavenge.
Collect 15 gas cans in a single Scavenge round.
Stop the enemy team from collecting any gas cans during a Scavenge round.
Prove you are stronger than Moustachio.
Make a Survivor drop a gas can during overtime.
Cause 25 gas can drops as a Special Infected.
Prove you are faster than Moustachio.
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.
Using the M60, kill 25 infected without letting go of the trigger.
Knock off the heads of 18 infected with the golf club.
Collect 10 items dropped by a Fallen Survivor.
Survive The Passing Campaign.
Play the new Midnight Riders song on a jukebox.
Kill a Tank only with damage from the original Survivors.
Open 5 foot lockers.
Have all 3 generators running at once in "The Sacrifice" finale.
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.
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!
Kill the Witch bride with a single shotgun blast on expert difficulty.
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
Kill 20 Jockeys with the shovel or pitchfork.
With a sharp melee weapon, cut a Smoker's tongue before he ensnares you.
Destroy 20 gascans as the Spitter.
Instantly kill a Survivor as the Charger.
Survive The Last Stand campaign on Expert Realism.
As the Spitter, spit on a Survivor who is pinned by a Charger.
Survive for 10 minutes on any official map in Versus Survival.
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 30 minutes on any official survival map.
Kill a pouncing Hunter with a shotgun.
Earn a bronze medal on any official Survival map.
Kill a Witch using only a sharp melee weapon, without anyone getting incapacitated or killed.
Earn a gold medal on any official survival map.
Earn a silver medal on any official survival map.
Discover the hidden room in the Last Stand campaign
Complete The Last Stand campaign in 13 minutes or less, without any Survivors dying.
Rescue three Survivors from a single rescue closet.
As the Boomer, vomit on a Survivor without having direct line of sight with them.
As the Hunter, land a 25 damage pounce.
As the Spitter, spit on a Survivor who is pinned by a Hunter.
Destroy a Tank's rock in mid-air.
On the concert finale, survive until the helicopter arrives without leaving the stage
Revive an incapacitated teammate while a Tank is nearby.
Survive The Last Stand campaign on any difficulty.
If you are reading this achievement, Gabe Newell has successfully launched Gnome Chompski into space.