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.
Plays games with free weekend players and helps them survive a campaign.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
Spread cheer by helping a free holiday player survive a campaign.
Survive a campaign on Expert skill with Realism mode enabled.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
Survive all campaigns on Expert.
As the Spitter, spit on a Survivor being choked by a Smoker.
As the Jockey, ride a Survivor and steer them into a Spitter's acid patch.
Form a team and beat an enemy team in 4v4 Versus or Scavenge.
As the Jockey, ride the Survivors twice in a single life.
Collect 100 gas cans in Scavenge.
As the Charger, grab a Survivor and smash them into the ground for a solid 15 seconds.
As the Charger, grab a Survivor and carry them over 80 feet.
Revive 10 dead Survivors with the defibrillator.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
Cause 25 gas can drops as a Special Infected.
As the Charger, bowl through the entire enemy team in a single charge.
Win a game of Scavenge.
As the Spitter, hit every Survivor with a single acid patch.
Make a Survivor drop a gas can during overtime.
Collect 15 gas cans in a single Scavenge round.
Stop the enemy team from collecting any gas cans during a Scavenge round.
Survive the Swamp Fever campaign.
Survive the Hard Rain campaign.
Survive the Dark Carnival campaign.
Rescue Gnome Chompski from the Carnival.
As the Jockey, ride a Survivor for more than 12 seconds.
Survive the Parish campaign.
Kill a Charger with a melee weapon while they are charging.
Finish a campaign using only melee weapons.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
Kill a Tank with melee weapons.
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.
Defend yourself at the crashed airliner without taking damage.
Honk the noses of 10 Clowns.
Ignite 50 Common Infected with incendiary ammo.
Kill 10 swampy Mudmen while they are in the water.
Kill one of each Uncommon Infected.
Kill 15 Infected with a single grenade launcher blast.
Use every melee weapon to kill Common Infected.
In a Survival round, get a medal only using melee weapons.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
Kill 100 Common Infected with the chainsaw.
Cross the bridge finale in less than three minutes.
Decapitate 200 Infected with a melee weapon.
Prove you are faster than Moustachio.
Survive the Dead Center campaign.
Deploy an ammo upgrade and have your team use it.
Use a bile bomb on a Tank.
Prove you are stronger than Moustachio.
Kill a Spitter before she is able to spit.
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.
Open 5 foot lockers.
Survive The Passing Campaign.
Collect 10 items dropped by a Fallen Survivor.
Knock off the heads of 18 infected with the golf club.
Play the new Midnight Riders song on a jukebox.
Kill a Tank only with damage from the original Survivors.
Using the M60, kill 25 infected without letting go of the trigger.
Have all 3 generators running at once in "The Sacrifice" finale.
As a Special Infected, incap someone who is trying to sacrifice themselves.
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.
Survive The Last Stand campaign on Expert Realism.
Escape Liberty Mall's Atrium before the first Tank appears
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.
Kill 20 Jockeys with the shovel or pitchfork.
Kill the Witch bride with a single shotgun blast on expert difficulty.
Earn a gold medal on every official survival map.
Find the golden crowbars hidden in the Left 4 Dead 1 survival maps.
Earn a silver medal on every official survival map.
Earn a bronze medal on every official survival map
With a sharp melee weapon, cut a Smoker's tongue before he ensnares you.
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 Charger.
As the Spitter, spit on a Survivor who is pinned by a Hunter.
As the Hunter, land a 25 damage pounce.
Kill a pouncing Hunter with a shotgun.
Instantly kill a Survivor as the Charger.
Survive for 10 minutes on any official map in Versus Survival.
Complete The Last Stand campaign in 13 minutes or less, without any Survivors dying.
Destroy a Tank's rock in mid-air.
Earn a silver medal on any official survival map.
Survive for 30 minutes on any official survival map.
Earn a gold medal on any official survival map.
Earn a bronze medal on any official Survival map.
Rescue three Survivors from a single rescue closet.
On the concert finale, survive until the helicopter arrives without leaving the stage
Discover the hidden room in the Last Stand campaign
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.