I'm reviewing and suggesting tag wiki edits on the last weeks and was suspecting that my tag wiki editions to this badge wasn't change. Today I suggested two tag editions and tested what happend with the Research Assistant tag editions count and it was still on the same, 9 editions. I already created/edited much more than 50 but the counter for this badge is freezed at 9 for a long time. There is some problem with the badge system or something that I missunderstood about this badge? Above there are the two prints that I made from my stats that comprove my suspected:
You only posted 10 tag wiki suggestions total:
You also edited tag wikis four times:
The rest are tag wiki excerpts, and they don't count, similar to how editing tags doesn't count towards the Copy Editor badge.
I'm not sure where the ninth one comes from, I must have miscounted somewhere. But still, what you did wasn't editing tag wikis, and therefore doesn't count towards the badge.