I just moused over a gold tag badge, and saw the popup
Earn at least 1000 total score for at least 200 non-community wiki answers in the linux tag
But my understanding was that one needed at least a thousand upvotes, which would be 10,000 score (assuming score is reputation). If it really does mean a thousand reputation, then the requirement is not merely that you've had a single upvote on each of a hundred answers, but that you have written a hundred more answers that weren't even worthy of a single upvote. That's weird.
So it looks to me like the score requirement is under by a factor of ten. The same is true of the mouseover text for the silver and bronze tag badges.
Or have I got the wrong end of this stick?