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Hello.
It is described in the FAQ below under "How does the badging system work?"
https://repost.aws/faq
I think you can get "Promotion Answers", "Promotion Winners", and "Contest Winners" by participating in events held occasionally at re:Post.
https://repost.aws/ja/questions/QURZv7rOcQQTC4ybsaQl1e-w/still-waiting-for-april-badge
The "AWS Community Builder" badge requires participation in AWS Community Builder.
https://aws.amazon.com/developer/community/community-builders/?nc1=h_ls
https://repost.aws/ja/questions/QU4BjJXXwwRQa_3L24CuF9wg/how-can-i-add-aws-community-builder-badge-to-the-re-post-profile
The "Research Participant" badge is unknown, but we expect it to require participation in some kind of event.
Thank you for providing that clear explanation.
The research participant is for answering an awsrepost questionnaire.
Relevant content
- AWS OFFICIALUpdated 4 years ago

Badges on re:Post are earned in different ways, depending on the activity. For example, Expert Approved comes from answers validated by AWS experts, Promotion and Contest badges are tied to special events, and Research Participant comes from joining AWS surveys or feedback programs. The Community Builder badge is linked to the AWS Community Builders program, which you apply for separately.
In general, the more you participate, answer questions, and get involved in AWS programs, the more badges you can earn.