Full list of all 65 Left 4 Dead 2 achievements worth 1,500 gamerscore. It takes around 20-25 hours to unlock all of the achievements in the base game.
The base game contains 50 achievements worth 1,000 Gamerscore, and there are 2 DLC packs containing 15 achievements worth 500 Gamerscore.
As the Charger, bowl through the entire enemy team in a single charge.
Survive a campaign on Expert skill with Realism mode enabled.
Survive all campaigns on Expert.
Kill a Charger with a melee weapon while they are charging.
Kill a Tank with melee weapons.
In a Survival round, get a medal only using melee weapons.
Revive 10 dead Survivors with the defibrillator.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
As the Jockey, ride the Survivors twice in a single life.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
Cause 25 gas can drops as a Special Infected.
Collect 100 gas cans in Scavenge.
Stop the enemy team from collecting any gas cans during a Scavenge round.
Make a Survivor drop a gas can during overtime.
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.
Collect 15 gas cans in a single Scavenge round.
Win a game of Scavenge.
As the Jockey, ride a Survivor for more than 12 seconds.
As the Charger, grab a Survivor and carry them over 80 feet.
As the Spitter, spit on a Survivor being choked by a Smoker.
As the Charger, grab a Survivor and smash them into the ground for a solid 15 seconds.
Finish a campaign using only melee weapons.
Navigate the sugar mill and reach the safe room without killing any Witches.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
Ignite 50 Common Infected with incendiary ammo.
Kill 10 swampy Mudmen while they are in the water.
Defend yourself at the crashed airliner without taking damage.
As the Spitter, hit every Survivor with a single acid patch.
Kill 15 Infected with a single grenade launcher blast.
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 Swamp Fever campaign.
Kill one of each Uncommon Infected.
Survive the Hard Rain campaign.
Survive the Parish campaign.
Use every melee weapon to kill Common Infected.
Survive the Dead Center campaign.
Kill 100 Common Infected with the chainsaw.
Honk the noses of 10 Clowns.
Deploy an ammo upgrade and have your team use it.
Decapitate 200 Infected with a melee weapon.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
Survive the Dark Carnival campaign.
Rescue Gnome Chompski from the Carnival.
Prove you are stronger than Moustachio.
Use a bile bomb on a Tank.
Prove you are faster than Moustachio.
Kill a Spitter before she is able to spit.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
As the Charger, grab a Survivor and crash them through 8 chairs at the wedding.
Survive The Passing Campaign.
Using the M60, kill 25 infected without letting go of the trigger.
Play 6 Mutations.
Play 5 full games of Scavenge on The Port.
Kill a Tank only with damage from the original Survivors.
Collect 10 items dropped by a Fallen Survivor.
Open 5 foot lockers.
Play the new Midnight Riders song on a jukebox.
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.
Have all 3 generators running at once in "The Sacrifice" finale.
Have Bill sacrifice himself for the team.
Complete "The Sacrifice".