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