As a Special Infected, incap someone who is trying to sacrifice themselves.
Complete "The Sacrifice".
Have Bill sacrifice himself for the team.
Have all 3 generators running at once in "The Sacrifice" finale.
Kill a Special Infected with an exploding barrel.
Play 6 Mutations.
As the Charger, grab a Survivor and crash them through 8 chairs at the wedding.
Play 5 full games of Scavenge on The Port.
Open 5 foot lockers.
Collect 10 items dropped by a Fallen Survivor.
Kill a Tank only with damage from the original Survivors.
Survive The Passing Campaign.
Knock off the heads of 18 infected with the golf club.
Play the new Midnight Riders song on a jukebox.
Using the M60, kill 25 infected without letting go of the trigger.
In a Survival round, get a medal only using melee weapons.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
Revive 10 dead Survivors with the defibrillator.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
Navigate the impound lot and reach the cemetery safe room without tripping any alarms.
Rescue Gnome Chompski from the Carnival.
Cause 25 gas can drops as a Special Infected.
Collect 100 gas cans in Scavenge.
Collect 15 gas cans in a single Scavenge round.
Make a Survivor drop a gas can during overtime.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
As the Charger, grab a Survivor and carry them over 80 feet.
As the Charger, bowl through the entire enemy team in a single charge.
Cross the bridge finale in less than three minutes.
Navigate the sugar mill and reach the safe room without killing any Witches.
Ignite 50 Common Infected with incendiary ammo.
Prove you are stronger than Moustachio.
Prove you are faster than Moustachio.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
Honk the noses of 10 Clowns.
Kill 10 swampy Mudmen while they are in the water.
Kill a Charger with a melee weapon while they are charging.
Kill a Spitter before she is able to spit.
As the Spitter, hit every Survivor with a single acid patch.
As the Spitter, spit on a Survivor being choked by a Smoker.
As the Jockey, ride a Survivor and steer them into a Spitter's acid patch.
As the Jockey, ride the Survivors twice in a single life.
Form a team and beat an enemy team in 4v4 Versus or Scavenge.
Kill one of each Uncommon Infected.
Win a game of Scavenge.
Stop the enemy team from collecting any gas cans during a Scavenge round.
As the Charger, grab a Survivor and smash them into the ground for a solid 15 seconds.
As the Jockey, ride a Survivor for more than 12 seconds.
Decapitate 200 Infected with a melee weapon.
Use a bile bomb on a Tank.
Kill 100 Common Infected with the chainsaw.
Finish a campaign using only melee weapons.
Survive the Swamp Fever campaign.
Survive all campaigns on Expert.
Use every melee weapon to kill Common Infected.
Defend yourself at the crashed airliner without taking damage.
Kill 15 Infected with a single grenade launcher blast.
Kill a Tank with melee weapons.
Survive the Hard Rain campaign.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
Survive the Dark Carnival campaign.
Deploy an ammo upgrade and have your team use it.
Survive the Dead Center campaign.
Survive a campaign on Expert skill with Realism mode enabled.
Survive the Parish campaign.