How many points does one need to gain, in order to get a top contributor * to a certain topic?

Answer 1

Just keep answering a lot of questions in that category. Answer only quality questions with helpful, informative quality answers to give you a better chance at getting Best Answer for your answers. The exact formula isn't publicized, but it's rumored we need to answer approx. 50 questions in the one category in a 30-day period, and of those answers, get 10% best answers. You'd have to maintain that balance of Best Answers to total answers to keep the Top Contributor badge once you get it. You can be Top Contributor in up to 3 categories.