Per-site metas lists some badges that are impossible to get. For example http://meta.tex.stackexchange.com/badges lists:
But these are impossibly to get because per-site metas do not support bounties, were not in a beta stage or Area 51 proposals. I therefore suggest that these badges are removed from the per-site metas. They have no function and they are confusing.
There are already badges that are unavailable on per-site metas but available on the main sites:
This seems to suggest that per-site metas should only contain badges that can be possibly awarded.