One of the mission badges is for creating a social group but that is not an option in the pull down menu.
Social group creation is limited to admins within this site, as social groups are spaces like communities. The "create a social group" badge was an out-of-the-box mission that came with this gamification system, which is why you're seeing it even though you are not able to earn the badge. You bring up a good point that it may be confusing, though, so I am going to deactivate the badge. Thanks for pointing this out!
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