No missable achievements (plus 73 unknown)
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Rescue a Survivor from a Smoker's tongue before he takes damage.
Kill a Smoker who has grabbed you with his tongue.
Kill a Tank without it dealing any damage to a Survivor.
Make 100 headshot kills.
You or another Survivor take no damage after being vomited on by a Boomer.
Blow up 20 Infected in a single explosion.
Light a Tank with a Molotov.
Protect any Survivor from an attacking Infected 50 times.
Rescue a Survivor trapped in a closet.
Set 101 Infected on fire.
Shove a Hunter off of a pinned and helpless Survivor.
Beat a campaign with all 4 Survivors.
Kill a Witch without any Survivor taking damage from her.
Kill 10 Smokers as they are pulling helpless Survivors.
Catch a rare strain of infection, then pass it on to someone else.
Kill an Infected with a single blow from behind.
Punch a Hunter as he is pouncing.
Light a Witch with a Molotov.
Survive the No Mercy campaign.
Save another Survivor from a Special Infected while on the ground.
Headshot a Hunter while he's leaping.
Survive the Dead Air campaign.
Survive the Death Toll campaign.
Shove a Boomer and then kill him without him splashing on anyone.
Survive the Blood Harvest campaign.
Survive the Crash Course Campaign.
Survive a campaign without being incapacitated.
Earn a Bronze medal in Survival mode on any official level.
Pounce two different Survivors on one life as a Hunter.
Heal a fellow Survivor when your own health is below 10.
Constrict two Survivors on one life as a Smoker.
Revive 50 incapacitated Survivors.
Complete one round of Survival on The Last Stand.
Give pain pills to 10 Survivors.
Dole out 5000 total Survivor damage as a Special Infected.
Leave a safe room to save an incapped teammate and bring them back safely.
Earn a Silver medal in Survival mode on any official level.
Heal 25 Survivors with a first aid kit.
As an Infected, incap a Survivor who has entered and left a safe room.
Drag a Survivor 100 feet with your tongue as a Smoker.
Sneak past all Witches in a campaign without disturbing one.
Earn a Gold medal in Survival mode on any official level.
Restart the generator within 30 seconds of it shutting off.
Kill a Witch with a single headshot.
Cover four Survivors with Boomer bile at once.
Kill all four Survivors on one life as a Tank.
Survive an entire campaign using only pistols.
Single-handedly kill a Tank.
No Survivors take damage after contacting the rescue vehicle.
Stun a Tank with an explosion in the Crash Course campaign.
Survive any campaign on Expert.
Finish a campaign without ever using a first aid kit on yourself.
All Survivors complete a campaign without being vomited on.
Win a Versus campaign of Crash Course.
Complete "The Sacrifice".
Kill 1000 Infected with a mounted machine gun.
Kill 53,595 Infected.
Have Bill sacrifice himself for the team.
Smoker pull a bile-covered Survivor until you hold him during Crash Course.
Play an entire campaign with no Survivors taking friendly fire damage.
Your team incapacitates three Survivors within five seconds.
Survive all campaigns on Expert.
Have all 3 generators running at once in "The Sacrifice" finale.
Earn at least a Bronze medal on every official Survival level.
Kill 5,359 Infected in the Crash Course campaign.
Kill a Special Infected with an exploding barrel.
Pounce a Survivor for 25 points of damage in the Crash Course campaign.
Survive a campaign with no Survivors taking damage from Special Infected.
Earn at least a Silver medal on every official Survival level.
Earn a Gold medal on every official Survival level.
Your team wipes all Survivors after the escape vehicle has opened in Crash Course.
As a Special Infected, incap someone who is trying to sacrifice themselves.
As A Tank hit 20 Survivors with a car in the Crash Course campaign.