Fixes to Achievement points count/mastery

Two minor updates to improve the Achievement Manager's handling of a player's completion rate.
One, UnlockStatus and the unlock map now track achievement category, such that TallyScore does not count unofficial achievements in counts/points.
Two, the determinations for mastery/completion are now improved to check (1) that the achievement triggering this is CORE (not UNOFFICIAL) and (2) that it has not already been unlocked at this level on the site, which should be sufficient to determine that the unlocking of this particular achievement completes/masters the game.

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