Epic is Uber stopped by yesterday to post the new achievements for Mob of the Dead, a zombie map releasing with the Uprising DLC on April 16. While gamerscore information was not included, the achievement descriptions may lend some insight as to what will be required to find the Easter egg on the map.
No One Escapes Alive
In Mob of the Dead, execute the escape plan.
Feed The Beast
In Mob of the Dead, Obtain Hell’s Retriever.
Making The Rounds
In Mob of the Dead, complete the cycle 3 times.
In Mob of the Dead, convert a weapon using a kit.
In Mob of the Dead, Brutus completes his patrol.
A Burst Of Flavor
In Mob of the Dead, Kill 10 zombies at once with a new beverage.
In Mob of the Dead, open a door without spending points.
In Mob of the Dead, survive an entire round on the bridge on Round 15 or higher.
Trapped in Time
In Mob of the Dead, use and upgrade all traps before round 10.
Pop Goes The Weasle
In Mob of the Dead, break the cycle.
A trailer showing some gameplay was also released; thanks to TravisSch for posting this one.
Mob of the Dead is a zombies map releasing on April 16 with the Uprising map pack, the second installment of the Call of Duty: Black Ops II season pass. For players without the pass, it can be purchased for 1200 Microsoft Points.