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