I totally agree with this, the description if read literally it is ambiguous.
I doubt that modifying this particular description will lead to modify others badges description like the ones in the list of @kiamlaluno because they are like:
(badge): (action) (times) (things)
Commentator: Left 10 comments.
Copy Editor: Edited 500 posts.
So for all of them, even if you read them literally, at some point you meet the exact requirement and obtain the badge.
But if you read this literally:
Convention: 10 posts with score of 2 on meta.
Having the badge doesn't necessarily mean you met the exact requirement at some point, as you can get it without having exactly 10 posts with score of 2 (e.g you can have some of them without exactly score of 2, but with higher score than 2 and you will still get it), if they change it to
... score of 2 or more on meta. it leaves no room for ambiguity.
Are there people who really think you have to have exactly 10 posts with score of 2? obviously not, but we should still fix this because people are getting annoyed by this. Not fixing it is like leaving "Satan" instead of "Santa" because everyone knows what the author meant.