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You were playing on Powerhouse, which is not an Anniversary map. These new achievements, unlike the previous ones, are map pack specific; this means you need to get the ones that say "Anniversary" on an Anniversary map, and the ones that say "Defiant" have to be on a Defiant map.
EDIT: Also, you didn't even fulfill the other requirement of the achievement. You have to get a Skullamanjaro (10 skulls AT THE SAME TIME), not just have 10+ points by the end of the game.
[Edited on 11.21.2011 1:54 AM PST]