It's easier than you think!
A few minutes ago, I answered this question and I believe my answer could help others in this community.
It will only take a few steps:
1) Invite them to create a free Backpack Mozilla account
" Open Badges communicate skills and achievements by providing a visual representation of your accomplishments packed with verifiable data and evidence."
2) Setup a free account and upload or push the badges you have earned in other platforms into it.
3) They can create their own personal and unique badges collections
Ex. My personal collections
4) Select Public view and Share Button
5) Share your accomplishments with the world! Social media or LinkedIn
Please don't forget to tag others, share and click my contents as helpful!