Try to create it, however its looks similar to other badge that i found on internet, well i got inspiration from google too and i'm using bitcoin logo. Since this is bitcointalk.

= 300 good report
= 1000 good report
= 5000 good report

Its contain number 300, 1000, 5000 in the image, but its too small. For bigger image https://imgur.com/a/EWFlVvQ.
Probably, theres always people who will abuse report to get that badge and glad mod will make it as bad report, maybe it will be good if you add bad report badge too, so people will not abuse report feature to get that good report badge.

P.S There's always better design than this.