The new Left 4 Dead 2 DLC Achievements for The Passing have been revealed, there are a total of 10 Achievements and you can find out what they are by continuing to read this article - obviously spoilers may entail.
Survive The Passing Campaign.
Port of Scavenge
Play 5 full games of Scavenge on The Port.
Knock off the heads of 18 infected with the golf club.
Til It Goes Click
Using the M60, kill 25 infected without letting go of the trigger.
Killing Them Swiftly To This Song
Play the new Midnight Riders song on a jukebox.
As the Charger, grab a Survivor and crash them through 8 chairs at the wedding.
Open 5 foot lockers.
Kite Like a Man
Kill a tank only with damage from the original Survivors.
Collect 10 items dropped by a Fallen Survivor.
Play 6 Mutations.