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 Dead Center campaign.
Survive the Dark Carnival campaign.
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 a Tank with melee weapons.
Deploy an ammo upgrade and have your team use it.
Kill 15 Infected with a single grenade launcher blast.
Use a bile bomb on a Tank.
Kill one of each Uncommon Infected.
Honk the noses of 10 Clowns.
Kill a Spitter before she is able to spit.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
Prove you are faster than Moustachio.
Prove you are stronger than Moustachio.
Rescue Gnome Chompski from the Carnival.
Form a team and beat an enemy team in 4v4 Versus or Scavenge.
Kill a Charger with a melee weapon while they are charging.
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.
As the Spitter, spit on a Survivor being choked by a Smoker.
Collect 100 gas cans in Scavenge.
Cross the bridge finale in less than three minutes.
Survive a campaign on Expert skill with Realism mode enabled.
Survive all campaigns on Expert.
Revive 10 dead Survivors with the defibrillator.
Navigate the sugar mill and reach the safe room without killing any Witches.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
Defend yourself at the crashed airliner without taking damage.
Kill 10 swampy Mudmen while they are in the water.
Cause 25 gas can drops as a Special Infected.
Navigate the impound lot and reach the cemetery safe room without tripping any alarms.
In a Survival round, get a medal only using melee weapons.
Ignite 50 Common Infected with incendiary ammo.
Kill 100 Common Infected with the chainsaw.
As the Jockey, ride a Survivor and steer them into a Spitter's acid patch.
Stop the enemy team from collecting any gas cans during a Scavenge round.
As the Charger, grab a Survivor and carry them over 80 feet.
As the Spitter, hit every Survivor with a single acid patch.
Win a game of Scavenge.
Make a Survivor drop a gas can during overtime.
As the Jockey, ride a Survivor for more than 12 seconds.
As the Jockey, ride the Survivors twice in a single life.
Collect 15 gas cans in a single Scavenge round.
As the Charger, grab a Survivor and smash them into the ground for a solid 15 seconds.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
Play 6 Mutations.
Open 5 foot lockers.
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.
Using the M60, kill 25 infected without letting go of the trigger.
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.
Kill a Special Infected with an exploding barrel.
As a Special Infected, incap someone who is trying to sacrifice themselves.
Have Bill sacrifice himself for the team.
Complete "The Sacrifice".
Have all 3 generators running at once in "The Sacrifice" finale.