The badge page has this description for the Research Assistant badge:
edited 50 tag wikis
It does not mention that editing excerpts does not count. This is just unfair. Please update the documentation.
I think this statement should be longer, documenting that excerpts do not count. I agree this is explained on Meta, but Meta should not be the primary place for getting documentation, or, if so, misleading documentation should be removed from other places.
The badge tab is the primary means for Stack Overflow users to get information about badges.And this tab contains misleading information that 50 wiki tags edits (= edits of any kind) are sufficient to obtain the badge. Explanations that "can be found somewhere else" are out of scope of this question.