One achievement involves "Cache Grab," which Valve describes as involving new foot lockers, while another is awarded for playing 6 mysterious "Mutations." Valve offers no explantation of what Mutations are, instead promising to reveal them tomorrow.
Valve also confirms that "one of the original Left 4 Dead Survivors is off shooting zombies in Heaven"--a tragedy that we'll likely see unfold in the new Left 4 Dead DLC that was tentatively scheduled for release a month or so after The Passing.
The Passing will be released this week for PC and Xbox 360, costing $7 (560 Microsoft Points) on 360. Until then, enjoy this list of new achievements.
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.