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