Complete the following task to unlock the corresponding achievement.
| Achievement | How to unlock |
| 101 Cremations | Set 101 Infected on fire.
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| Akimbo Assassin | Survive a campaign firing no guns other than pistols.
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| All 4 Dead | Kill all four Survivors on one life as a Tank.
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| Back 2 Help | Leave a safe room to save an incapped teammate and bring them back
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| Barf Bagged | Cover four Survivors with Boomer bile at once.
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| Big Drag | Drag a Survivor x distance with your tongue.
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| Blind Luck | You or another Survivor take no damage after being vomited on by a Boomer.
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| Brain Salad | Make 100 headshot kills.
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| Burn the Witch | Light a Witch with a Molotov.
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| Chain Smoker | Constrict two Survivors on one life as a Smoker.
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| Clean Kill | Shove a Boomer and then kill him without him splashing on anyone.
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| Cr0wnd | Kill a Witch with a single headshot.
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| Dead Baron | Survive the Dead Air campaign.
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| Dead Giveaway | Heal a fellow Survivor when your own health is below 10.
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| Dead Stop | Punch a Hunter as he is pouncing.
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| Dead Wreckening | Dole out 5000 total Survivor damage as a Special Infected.
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| Do Not Disturb | Sneak past all Witches in a campaign without disturbing one.
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| Double Jump | Pounce two different Survivors on one life as a Hunter.
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| Drag and Drop | Rescue a Survivor from a Smoker's tongue before he takes damage.
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| Field Medic | Heal 25 Survivors with a first aid kit.
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| Grim Reaper | Survive the Blood Harvest campaign.
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| Ground Cover | Save another Survivor from a Special Infected while on the ground.
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| Helping Hand | Revive 50 incapacitated Survivors.
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| Hero Closet | Rescue a Survivor trapped in a closet.
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| Hunter Punter | Shove a Hunter off of a pinned and helpless Survivor.
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| Jump Shot | Headshot a Hunter while he's leaping.
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| Lamb 2 Slaughter | Incapacitate a Survivor after he has entered and exited a safe room.
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| Man vs Tank | Single-handedly kill a Tank.
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| Mercy Killer | Survive the No Mercy campaign.
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| My Bodyguard | Protect any Survivor from an attacking Infected 50 times.
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| No Smoking Section | Kill 10 Smokers as they are pulling helpless Survivors.
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| No-One Left Behind | Beat a campaign with all 4 Survivors.
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| Nothing Special | Survive a campaign with no Survivors taking damage from Specials.
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| Pharm-assist | Give pain pills to 10 Survivors.
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| Pyrotechnician | Blow up 20 Infected in a single explosion.
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| Red Mist | Kill 1000 Infected with a mounted machine gun.
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| Safety First | Play through a campaign with no Survivors taking friendly fire damage.
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| Spinal Tap | Kill an Infected with a single blow from behind.
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| Stand Tall | Survive a campaign without being incapacitated.
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| Stomach Upset | All Survivors complete a campaign without being vomited on.
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| Tankbusters | Kill a Tank without it dealing any damage to a Survivor.
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| Toll Collector | Survive the Death Toll campaign.
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| Tongue Twister | Kill a Smoker who has grabbed you with his tongue.
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| Towering Inferno | Light a Tank with a Molotov.
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| Unbreakable | Beat a campaign without ever using a first aid kit on yourself.
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| Untouchables | No Survivors take damage after contacting the rescue vehicle.
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| What Are You Trying To Prove? | Survive all campaigns on Impossible.
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| Witch Hunter | Kill a Witch without any Survivor taking damage from her.
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| Zombicidal Maniac | Survive any campaign on Impossible.
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| Zombie Genocidest | Kill 53,595 Infected.
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