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