Each badge description with a single sentence doesn't contain a dot. Except for Enthusiast and Fanatic badges:
I think those descriptions for Enthusiast and Fanatic badges should be changed from the current form:
Visit the site each day for {N} consecutive days. (Days are counted in UTC.)
to non-dot form:
Visit the site each day for {N} consecutive days (days are counted in UTC)
or even more short version:
Visit the site each day for {N} consecutive days (counted in UTC)
for the consistency with another descriptions on the badges page.
Seems the inconsistency has been appear after accepting that FR: Add 'UTC' to description to 'fanatic' badge description