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Recording that you walked it, which is what earns badges.
Logging is different from rating. Rating says what you thought of the hike; logging records that you walked it, on a date, with your quiz score. It needs an account.
The finish screen in trail mode offers it, and it is what feeds:
You can log a hike more than once if you walk it more than once, though repeat walks of the same trail do not move you toward the milestone badges — those count distinct hikes.