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.
As the Charger, bowl through the entire enemy team in a single charge.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
Revive 10 dead Survivors with the defibrillator.
Defend yourself at the crashed airliner without taking damage.
Cross the bridge finale in less than three minutes.
Form a team and beat an enemy team in 4v4 Versus or Scavenge.
As the Charger, grab a Survivor and carry them over 80 feet.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
Kill a Tank with melee weapons.
As the Jockey, ride a Survivor and steer them into a Spitter's acid patch.
Collect 100 gas cans in Scavenge.
Finish a campaign using only melee weapons.
In a Survival round, get a medal only using melee weapons.
Cause 25 gas can drops as a Special Infected.
Make a Survivor drop a gas can during overtime.
Stop the enemy team from collecting any gas cans during a Scavenge round.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
Kill 10 swampy Mudmen while they are in the water.
Honk the noses of 10 Clowns.
As the Spitter, hit every Survivor with a single acid patch.
Collect 15 gas cans in a single Scavenge round.
As the Jockey, ride the Survivors twice in a single life.
As the Spitter, spit on a Survivor being choked by a Smoker.
Win a game of Scavenge.
As the Jockey, ride a Survivor for more than 12 seconds.
As the Charger, grab a Survivor and smash them into the ground for a solid 15 seconds.
Survive the Parish campaign.
Navigate the impound lot and reach the cemetery safe room without tripping any alarms.
Survive the Hard Rain campaign.
Survive the Swamp Fever campaign.
Kill 100 Common Infected with the chainsaw.
Kill one of each Uncommon Infected.
Use a bile bomb on a Tank.
Use every melee weapon to kill Common Infected.
Survive the Dark Carnival campaign.
Decapitate 200 Infected with a melee weapon.
Kill a Charger with a melee weapon while they are charging.
Prove you are faster than Moustachio.
Prove you are stronger than Moustachio.
Survive the Dead Center campaign.
Kill 15 Infected with a single grenade launcher blast.
Kill a Spitter before she is able to spit.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
Ignite 50 Common Infected with incendiary ammo.
Navigate the sugar mill and reach the safe room without killing any Witches.
Deploy an ammo upgrade and have your team use it.
Rescue Gnome Chompski from the Carnival.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
Using the M60, kill 25 infected without letting go of the trigger.
Collect 10 items dropped by a Fallen Survivor.
Open 5 foot lockers.
Play 6 Mutations.
As the Charger, grab a Survivor and crash them through 8 chairs at the wedding.
Play 5 full games of Scavenge on The Port.
Survive The Passing Campaign.
Kill a Tank only with damage from the original Survivors.
Knock off the heads of 18 infected with the golf club.
Play the new Midnight Riders song on a jukebox.
Complete "The Sacrifice".
Have Bill sacrifice himself for the team.
Kill a Special Infected with an exploding barrel.
Have all 3 generators running at once in "The Sacrifice" finale.
As a Special Infected, incap someone who is trying to sacrifice themselves.