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.
Survive the Swamp Fever campaign.
Survive the Hard Rain campaign.
Survive the Parish campaign.
Finish a campaign using only melee weapons.
Decapitate 200 Infected with a melee weapon.
Use every melee weapon to kill Common Infected.
Kill 100 Common Infected with the chainsaw.
Revive 10 dead Survivors with the defibrillator.
Ignite 50 Common Infected with incendiary ammo.
Kill 15 Infected with a single grenade launcher blast.
Kill one of each Uncommon Infected.
Kill 10 swampy Mudmen while they are in the water.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
Honk the noses of 10 Clowns.
Kill a Spitter before she is able to spit.
Prove you are faster than Moustachio.
Prove you are stronger than Moustachio.
Rescue Gnome Chompski from the Carnival.
Defend yourself at the crashed airliner without taking damage.
Navigate the sugar mill and reach the safe room without killing any Witches.
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 Charger, bowl through the entire enemy team in a single charge.
Kill a Charger with a melee weapon while they are charging.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
Collect 100 gas cans in Scavenge.
Collect 15 gas cans in a single Scavenge round.
Cause 25 gas can drops as a Special Infected.
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.
In a Survival round, get a medal only using melee weapons.
As the Spitter, hit every Survivor with a single acid patch.
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.
Win a game of Scavenge.
Make a Survivor drop a gas can during overtime.
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.
As the Jockey, ride a Survivor for more than 12 seconds.
Kill a Tank with melee weapons.
Survive the Dark Carnival campaign.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
Use a bile bomb on a Tank.
Survive the Dead Center campaign.
Deploy an ammo upgrade and have your team use it.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
Survive all campaigns on Expert.
Survive a campaign on Expert skill with Realism mode enabled.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
Form a team and beat an enemy team in 4v4 Versus or Scavenge.
Collect 10 items dropped by a Fallen Survivor.
Open 5 foot lockers.
Play 6 Mutations.
Using the M60, kill 25 infected without letting go of the trigger.
Play 5 full games of Scavenge on The Port.
Kill a Tank only with damage from the original Survivors.
Survive The Passing Campaign.
Knock off the heads of 18 infected with the golf club.
Play the new Midnight Riders song on a jukebox.
As the Charger, grab a Survivor and crash them through 8 chairs at the wedding.
Complete "The Sacrifice".
Have Bill sacrifice himself for the team.
Have all 3 generators running at once in "The Sacrifice" finale.
Kill a Special Infected with an exploding barrel.
As a Special Infected, incap someone who is trying to sacrifice themselves.