A couple of days ago, I was awarded the "refiner" badge ["Edit and answer 50 questions (both actions within 12 hours, answer score > 0"]. But in the last couple of weeks, I've barely been active on MSE, so I couldn't have done all this. I was baffled until I started writing this question, where the "Similar questions" suggestions led me to some enlightenment. I'm a native english speaker, and completely misunderstood the badge description. That suggests to me that a rewrite might be in order.
I now see (looking at Refiner and Illuminator badges confusing) that the intended meaning is the following:
For at least 50 questions, do X, where X is "both edit and answer the question, with an answer score > 0, within 12 hours",
Within 12 hours, do Z for at least 50 questions, where Z is "both edit and answer the question, with an answer score > 0."
I don't have a proposed rephrasing, because the scoping of adverbial phrases in English doesn't seem to have enough precision to allow what's wanted in a single sentence.