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I got the achievement since my previous post too (Have all "Age of zombies"-achivements now, go me! :D ), also after re-installing the game, when...
True, christmas decorations in-game 2/3 through January is a tad silly, but Halfbrick has a good excuse, massive flooding nearby and all......
I've been having a similar problem, no matter how hard i try, i end up with 66.xx% accuracy, i can handle having crappy aim, but it's always 66...