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