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The Lua error "attempt to call global 'OBJECT' a nil value" means that OBJECT does not exist. "nil" means nothing in a literal sense. There is no addCategory function and the achievement API does not have provisions to allow custom categories. You'll have to write an addon that can do so or find one that provides the functionality you're looking for. I suggest the addon Overachiever, it has the ability to "watch" achievements in a separate tab in the achievement UI as if they were visually in a separate category.
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