So.. It seemed the badges go like this for photos, edits, and categories
--Bronze--
Tier 0-1 count
Tier 1-5 counts
Tier 2-10 counts
--Silver--
Tier 3-25 counts
Tier 4-50 counts
Tier 5-100 counts.
This is based off personal experience, because I got to a tier 4 badge, and it gave me the number I needed for the next badge up, a tier 5. The coming values are just theories based off the patterns.
--Gold--
Tier 6-250 counts.
Tier 7-500 counts. (Not shown in categories but I think it's still there. Maybe it's not though!)
EDIT:I just got a tier 6 badge. The values I theorized turned out to be correct. Now we can be certain, guys!
This leaves room for a final Tier 8, but they're not on the badge list. But who knows, there were many badges not on the badge list before, they weren't even photos on the wikia! And they still worked! So maybe there is a Tier 8 for 1000 counts and we haven't seen them!