The new Achievements were stealthily been added overnight, and normally indicate the impending arrival of new downloadable content, as has been the case in the past with Halo 3 and Gears of War 2.
The new achievements are:
- Undisputed - Complete Ahern's survival mission (50)
- New Sheriff in Town - Take first place in any combat scenario on Pinnacle Station (50)
- Best of the Best - Take first place in 12 combat scenarios on Pinnacle Station (50)