Here is the full list of all 73 Left 4 Dead achievements. It takes around 60-80 hours to unlock all of the achievements on Windows.
Kill a Witch with a single headshot.
Survive an entire campaign using only pistols.
Single-handedly kill a Tank.
Play an entire campaign with no Survivors taking friendly fire damage.
Kill 1000 Infected with a mounted machine gun.
Kill 53,595 Infected.
Save another Survivor from a Special Infected while on the ground.
Leave a safe room to save an incapped teammate and bring them back safely.
Survive any campaign on Expert.
Survive all campaigns on Expert.
Survive a campaign with no Survivors taking damage from Special Infected.
Cover four Survivors with Boomer bile at once.
Drag a Survivor 100 feet with your tongue as a Smoker.
Kill all four Survivors on one life as a Tank.
Dole out 5000 total Survivor damage as a Special Infected.
As an Infected, incap a Survivor who has entered and left a safe room.
Complete one round of Survival on The Last Stand.
Earn a Bronze medal in Survival mode on any official level.
Earn a Silver medal in Survival mode on any official level.
Earn a Gold medal in Survival mode on any official level.
Earn at least a Bronze medal on every official Survival level.
Earn at least a Silver medal on every official Survival level.
Earn a Gold medal on every official Survival level.
Survive the Crash Course Campaign.
Restart the generator within 30 seconds of it shutting off.
Kill 5,359 Infected in the Crash Course campaign.
Your team wipes all Survivors after the escape vehicle has opened in Crash Course.
As A Tank hit 20 Survivors with a car in the Crash Course campaign.
Pounce a Survivor for 25 points of damage in the Crash Course campaign.
Smoker pull a bile-covered Survivor until you hold him during Crash Course.
Stun a Tank with an explosion in the Crash Course campaign.
Your team incapacitates three Survivors within five seconds.
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.
Heal 25 Survivors with a first aid kit.
Shove a Boomer and then kill him without him splashing on anyone.
Survive the Dead Air campaign.
Win a Versus campaign of Crash Course.
Pounce two different Survivors on one life as a Hunter.
Catch a rare strain of infection, then pass it on to someone else.
Revive 50 incapacitated Survivors.
Sneak past all Witches in a campaign without disturbing one.
Finish a campaign without ever using a first aid kit on yourself.
Survive a campaign without being incapacitated.
All Survivors complete a campaign without being vomited on.
Survive the Blood Harvest campaign.
No Survivors take damage after contacting the rescue vehicle.
Survive the Death Toll campaign.
Beat a campaign with all 4 Survivors.
Give pain pills to 10 Survivors.
Heal a fellow Survivor when your own health is below 10.
Constrict two Survivors on one life as a Smoker.
You or another Survivor take no damage after being vomited on by a Boomer.
Blow up 20 Infected in a single explosion.
Protect any Survivor from an attacking Infected 50 times.
Kill a Tank without it dealing any damage to a Survivor.
Kill a Witch without any Survivor taking damage from her.
Light a Witch with a Molotov.
Make 100 headshot kills.
Kill an Infected with a single blow from behind.
Punch a Hunter as he is pouncing.
Kill 10 Smokers as they are pulling helpless Survivors.
Rescue a Survivor trapped in a closet.
Set 101 Infected on fire.
Shove a Hunter off of a pinned and helpless Survivor.
Rescue a Survivor from a Smoker's tongue before he takes damage.
Survive the No Mercy campaign.
Kill a Smoker who has grabbed you with his tongue.
Light a Tank with a Molotov.
Headshot a Hunter while he's leaping.