How many positive arrows does a question need to be considered a well received question?
I believe for the badges (Curious, Inquisitive and Socratic), a "well-received question" means that the question itself has a positive score, i.e. 1 or more. This can be 2 positives and 1 negative vote, it's still well received in total.
Looking at your question history, this would mean you have 3 out of 5 well-received questions for the Curious badge (for the main site).