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I think you are mixing different things together. Here on community forums we have badges which are rewarded automatically to users based on their accepted solutions, comments, votes etc. and these badges are just personal badges for community. And I dont see any marketplace vendor badge in those (you can check them here: https://community.atlassian.com/t5/user/viewprofilepage/user-id/5032643?show=badges#details).
If you are interested in getting marketplace vendor badge on marketplace for your apps you have to fulfill lots of different steps there.
"Marketplace Vendor" is an Atlassian partner (company, not individual) who has to satisfy a number of requirements. Some of these include having a certain number of certified and accredited individuals on staff, doing a certain amount in sales, etc.
