There are several queries on the data explorer site that show your progress toward the various editing badges like Editor, Strunk & White, and Copy Editor. Based on most of these queries and my own results, it seems like the badges are filtering on a post type of "question", so that editing other users' answers does not contribute toward these badges.
I'm curious about why the design team would exclude answer edits. Was there a technical problem, or did they really think that question editing was much more important than answer editing?