While trollin around the review section, I noticed that I only have 38 edits. I'm very sure that I have edited more than 38 questions - so I was wondering if there is a certain criteria that needs to be met in order for it to count towards the badge?
You have edited 38 distinct posts that did not belong to you and have not since been deleted. Editing the same post more than once only adds one to that count, and deleted posts along with edits to your own posts are not included in that particular counter.
If you want to see all of the edits that you've made to non-deleted posts (outside of the grace period) that is visible in your activity.