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.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
As the Charger, bowl through the entire enemy team in a single charge.
Kill a Charger with a melee weapon while they are charging.
Kill a Tank with melee weapons.
Revive 10 dead Survivors with the defibrillator.
As the Charger, grab a Survivor and carry them over 80 feet.
Survive a campaign on Expert skill with Realism mode enabled.
Navigate the impound lot and reach the cemetery safe room without tripping any alarms.
Cross the bridge finale in less than three minutes.
Collect 100 gas cans in Scavenge.
Cause 25 gas can drops as a Special Infected.
Navigate the sugar mill and reach the safe room without killing any Witches.
In a Survival round, get a medal only using melee weapons.
As the Spitter, spit on a Survivor being choked by a Smoker.
Stop the enemy team from collecting any gas cans during a Scavenge round.
Honk the noses of 10 Clowns.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
Kill 15 Infected with a single grenade launcher blast.
Defend yourself at the crashed airliner without taking damage.
Kill 10 swampy Mudmen while they are in the water.
Finish a campaign using only melee weapons.
Collect 15 gas cans in a single Scavenge round.
Prove you are faster than Moustachio.
Ignite 50 Common Infected with incendiary ammo.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
Kill 100 Common Infected with the chainsaw.
Decapitate 200 Infected with a melee weapon.
Win a game of Scavenge.
Make a Survivor drop a gas can during overtime.
Survive the Hard Rain campaign.
Survive the Swamp Fever campaign.
Kill one of each Uncommon Infected.
As the Jockey, ride the Survivors twice in a single life.
Survive the Dead Center campaign.
Use a bile bomb on a Tank.
Survive the Dark Carnival campaign.
Rescue Gnome Chompski from the Carnival.
Prove you are stronger than Moustachio.
Use every melee weapon to kill Common Infected.
Survive the Parish campaign.
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 Jockey, ride a Survivor for more than 12 seconds.
As the Jockey, ride a Survivor and steer them into a Spitter's acid patch.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
Deploy an ammo upgrade and have your team use it.
Kill a Spitter before she is able to spit.
Survive all campaigns on Expert.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
Form a team and beat an enemy team in 4v4 Versus or Scavenge.
As the Charger, grab a Survivor and crash them through 8 chairs at the wedding.
Play 6 Mutations.
Play 5 full games of Scavenge on The Port.
Open 5 foot lockers.
Kill a Tank only with damage from the original Survivors.
Collect 10 items dropped by a Fallen Survivor.
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.
Knock off the heads of 18 infected with the golf club.
As a Special Infected, incap someone who is trying to sacrifice themselves.
Have all 3 generators running at once in "The Sacrifice" finale.
Kill a Special Infected with an exploding barrel.
Have Bill sacrifice himself for the team.
Complete "The Sacrifice".