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 all campaigns on Expert.
Survive a campaign on Expert skill with Realism mode enabled.
Form a team and beat an enemy team in 4v4 Versus or Scavenge.
Cause 25 gas can drops as a Special Infected.
Collect 100 gas cans in Scavenge.
Revive 10 dead Survivors with the defibrillator.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
Finish a campaign using only melee weapons.
As the Spitter, spit on a Survivor being choked by a Smoker.
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 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.
As the Jockey, ride the Survivors twice in a single life.
Navigate the impound lot and reach the cemetery safe room without tripping any alarms.
Cross the bridge finale in less than three minutes.
As the Jockey, ride a Survivor and steer them into a Spitter's acid patch.
Defend yourself at the crashed airliner without taking damage.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
Spread cheer by helping a free holiday player survive a campaign.
Win a game of Scavenge.
Make a Survivor drop a gas can during overtime.
Collect 15 gas cans in a single Scavenge round.
In a Survival round, get a medal only using melee weapons.
Kill 15 Infected with a single grenade launcher blast.
Navigate the sugar mill and reach the safe room without killing any Witches.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
Ignite 50 Common Infected with incendiary ammo.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
As the Jockey, ride a Survivor for more than 12 seconds.
Stop the enemy team from collecting any gas cans during a Scavenge round.
Survive the Parish campaign.
Use every melee weapon to kill Common Infected.
Survive the Hard Rain campaign.
Decapitate 200 Infected with a melee weapon.
Survive the Swamp Fever campaign.
Kill 10 swampy Mudmen while they are in the water.
Kill one of each Uncommon Infected.
Kill a Tank with melee weapons.
Survive the Dark Carnival campaign.
Rescue Gnome Chompski from the Carnival.
Prove you are stronger than Moustachio.
Prove you are faster than Moustachio.
Honk the noses of 10 Clowns.
Kill 100 Common Infected with the chainsaw.
Survive the Dead Center campaign.
Kill a Charger with a melee weapon while they are charging.
Use a bile bomb on a Tank.
Deploy an ammo upgrade and have your team use it.
Kill a Spitter before she is able to spit.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
Plays games with free weekend players and helps them survive a campaign.
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.
Kill a Tank only with damage from the original Survivors.
Open 5 foot lockers.
Collect 10 items dropped by a Fallen Survivor.
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.
Kill a Special Infected with an exploding barrel.
Complete "The Sacrifice".
Have Bill sacrifice himself for the team.
Have all 3 generators running at once in "The Sacrifice" finale.
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 any difficulty.
Destroy a Tank's rock in mid-air.
Kill a pouncing Hunter with a shotgun.
Earn a bronze medal on any official Survival map.
Earn a silver medal on any official survival map.
Earn a gold medal on any official survival map.
Survive The Last Stand campaign on Expert Realism.
Find the golden crowbars hidden in the Left 4 Dead 1 survival maps.
Revive an incapacitated teammate while a Tank is nearby.
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.
Destroy 20 gascans as the Spitter.
Instantly kill a Survivor as the Charger.
As the Boomer, vomit on a Survivor without having direct line of sight with them.
Rescue three Survivors from a single rescue closet.
With a sharp melee weapon, cut a Smoker's tongue before he ensnares you.
Kill the Witch bride with a single shotgun blast on expert difficulty.
As the Hunter, land a 25 damage pounce.
Kill 20 Jockeys with the shovel or pitchfork.
Survive for 10 minutes on any official map in Versus Survival.
Kill 53,599 infected. You made sure the dead won't rise anymore!
Escape Liberty Mall's Atrium before the first Tank appears
Discover the hidden room in the Last Stand campaign
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.
Survive for 30 minutes on any official survival map.
Kill a Witch using only a sharp melee weapon, without anyone getting incapacitated or killed.
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.
If you are reading this achievement, Gabe Newell has successfully launched Gnome Chompski into space.