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