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