I think we should have our comp ranks in the post bit. Maybe the icon logo would be dope. It would at least improve awareness for competitive play.

EDit: sorry, postbit as in the profile part of a post to the left here in case you didn't know.
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This is a cool idea, but it might look kinda weird. Here's an idea though:

I was thinking of just having the icon underneath the achievements

Yeah, just the icon is enough, with the Silver/Gold/Diamond and/or rank number text when you hover the cursor on it.