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