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 all campaigns on Expert.
Survive a campaign on Expert skill with Realism mode enabled.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
Navigate the impound lot and reach the cemetery safe room without tripping any alarms.
Cross the bridge finale in less than three minutes.
Survive the Parish campaign.
Use every melee weapon to kill Common Infected.
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.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
Revive 10 dead Survivors with the defibrillator.
Collect 100 gas cans in Scavenge.
Cause 25 gas can drops as a Special Infected.
Kill 10 swampy Mudmen while they are in the water.
Finish a campaign using only melee weapons.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
Navigate the sugar mill and reach the safe room without killing any Witches.
Kill 100 Common Infected with the chainsaw.
Survive the Hard Rain campaign.
Kill a Charger with a melee weapon while they are charging.
As the Charger, grab a Survivor and carry them over 80 feet.
As the Charger, bowl through the entire enemy team in a single charge.
Make a Survivor drop a gas can during overtime.
Collect 15 gas cans in a single Scavenge round.
Kill a Tank with melee weapons.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
Kill one of each Uncommon Infected.
Survive the Swamp Fever campaign.
Ignite 50 Common Infected with incendiary ammo.
Prove you are faster than Moustachio.
Prove you are stronger than Moustachio.
Decapitate 200 Infected with a melee weapon.
Survive the Dark Carnival campaign.
Rescue Gnome Chompski from the Carnival.
Honk the noses of 10 Clowns.
Deploy an ammo upgrade and have your team use it.
As the Charger, grab a Survivor and smash them into the ground for a solid 15 seconds.
As the Spitter, spit on a Survivor being choked by a Smoker.
As the Jockey, ride a Survivor and steer them into a Spitter's acid patch.
In a Survival round, get a medal only using melee weapons.
Use a bile bomb on a Tank.
As the Jockey, ride the Survivors twice in a single life.
As the Spitter, hit every Survivor with a single acid patch.
Kill a Spitter before she is able to spit.
Win a game of Scavenge.
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 Dead Center campaign.
Form a team and beat an enemy team in 4v4 Versus or Scavenge.
Play 6 Mutations.
Collect 10 items dropped by a Fallen Survivor.
Open 5 foot lockers.
Play 5 full games of Scavenge on The Port.
Kill a Tank only with damage from the original Survivors.
Using the M60, kill 25 infected without letting go of the trigger.
As the Charger, grab a Survivor and crash them through 8 chairs at the wedding.
Survive The Passing Campaign.
Knock off the heads of 18 infected with the golf club.
Play the new Midnight Riders song on a jukebox.
Kill a Special Infected with an exploding barrel.
As a Special Infected, incap someone who is trying to sacrifice themselves.
Complete "The Sacrifice".
Have Bill sacrifice himself for the team.
Have all 3 generators running at once in "The Sacrifice" finale.