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.
Kill a Charger with a melee weapon while they are charging.
Survive all campaigns on Expert.
Survive a campaign on Expert skill with Realism mode enabled.
Revive 10 dead Survivors with the defibrillator.
Cause 25 gas can drops as a Special Infected.
Collect 100 gas cans in Scavenge.
Defend yourself at the crashed airliner without taking damage.
Make a Survivor drop a gas can during overtime.
Collect 15 gas cans in a single Scavenge round.
As the Jockey, ride the Survivors twice in a single life.
As the Charger, grab a Survivor and carry them over 80 feet.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
In a Survival round, get a medal only using melee weapons.
As the Spitter, spit on a Survivor being choked by a Smoker.
Form a team and beat an enemy team in 4v4 Versus or Scavenge.
Stop the enemy team from collecting any gas cans during a Scavenge round.
Win a game of Scavenge.
Survive the Swamp Fever campaign.
Kill 10 swampy Mudmen while they are in the water.
As the Charger, bowl through the entire enemy team in a single charge.
Kill a Tank with melee weapons.
Cross the bridge finale in less than three minutes.
Navigate the impound lot and reach the cemetery safe room without tripping any alarms.
As the Spitter, hit every Survivor with a single acid patch.
Rescue Gnome Chompski from the Carnival.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
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.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
Survive the Parish campaign.
Survive the Hard Rain campaign.
Navigate the sugar mill and reach the safe room without killing any Witches.
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.
Use every melee weapon to kill Common Infected.
Ignite 50 Common Infected with incendiary ammo.
Kill 15 Infected with a single grenade launcher blast.
Kill 100 Common Infected with the chainsaw.
Use a bile bomb on a Tank.
Kill one of each Uncommon Infected.
Survive the Dead Center campaign.
Decapitate 200 Infected with a melee weapon.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
As the Jockey, ride a Survivor and steer them into a Spitter's acid patch.
Survive the Dark Carnival campaign.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
Deploy an ammo upgrade and have your team use it.
Spread cheer by helping a free holiday player survive a campaign.
Kill a Spitter before she is able to spit.
As the Charger, grab a Survivor and crash them through 8 chairs at the wedding.
Play 5 full games of Scavenge on The Port.
Play 6 Mutations.
Collect 10 items dropped by a Fallen Survivor.
Kill a Tank only with damage from the original Survivors.
Open 5 foot lockers.
Knock off the heads of 18 infected with the golf club.
Using the M60, kill 25 infected without letting go of the trigger.
Survive The Passing Campaign.
Play the new Midnight Riders song on a jukebox.
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 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.
Kill 53,599 infected. You made sure the dead won't rise anymore!
Survive for 30 minutes on any 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
Escape Liberty Mall's Atrium before the first Tank appears
Instantly kill a Survivor as the Charger.
Destroy 20 gascans as the Spitter.
With a sharp melee weapon, cut a Smoker's tongue before he ensnares you.
Rescue three Survivors from a single rescue closet.
Survive The Last Stand campaign on Expert Realism.
Complete The Last Stand campaign in 13 minutes or less, without any Survivors dying.
Survive The Last Stand campaign on any difficulty.
Discover the hidden room in the Last Stand campaign
Earn a gold medal on any official survival map.
Survive for 10 minutes on any official map in Versus Survival.
Earn a silver medal on any official survival map.
Earn a bronze medal on any official Survival map.
Destroy a Tank's rock in mid-air.
Kill 20 Jockeys with the shovel or pitchfork.
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.
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.
As the Hunter, land a 25 damage pounce.
As the Boomer, vomit on a Survivor without having direct line of sight with them.
Kill a pouncing Hunter with a shotgun.
Revive an incapacitated teammate while a Tank is nearby.
If you are reading this achievement, Gabe Newell has successfully launched Gnome Chompski into space.