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