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