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