Once you've got taxonomist, could there be a way to find out wich tag helped you get it? Today I logged in and much to my surprise I got one! Only thing I did was changing some tags like office2007 -> office-2007 and some others (I don't recall every retag I've done, and the system doesn't allow to see a list of one's edits to others questions/answers).
I guess I had (slim) hopes to get one, but it really came as a surprise, as I imagined someone else would have made (for example) office-2007 before, and then got edited because of the office2007 majority, so in any case the one who would get the
taxonomist badge would be the original poster.