The description of the rules for awarding tag badges as stated on the badges page seems inconsistent and confusing.
This mso faq post states that the metric used is "sum of upvotes - sum of downvotes". However, badge descriptions (and tooltips) use the term "upvotes" (which isn't accurate) while the legend on the page use "total score" (without explaining what a score means).
Always use "total score" ("upvotes" is misleading) when describing the tag badges. E.g.:
Achieve a total score of 100 for at least 20 answers in the .net tag
Explicitly define what "total score" means, perhaps in a tooltip and/or a link in the legend section to the relevant faq.
Here's a mockup to speak the thousand words...