Taming a horse completes the "A Complete Catalogue" challenge.
What I expected to happen was...:
I would tame a horse and make only the advancement "Best Friends Forever".
What actually happened was...:
I tamed a horse and completed the "A Complete Catalogue" challenge in addition to the advancement "Best Friends Forever".
Steps to Reproduce:
1. Tame a horse in a new world.
2. Receive notification of advancement "Best Friends Forever" and challenge "A Complete Catalogue" simultaneously.
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Asteraoth, thank you for your speedy reply. I tried searching before reporting, but couldn't figure out how to format my search query to bring up any results and would have had to look through the entire registry of reports manually to find if the issue had been previously reported.
If encouraging people to search before reporting, maybe it would be better if they could do a simple search instead of having to format it. There are a lot of kids and people with little to no technical or programming knowledge that play this game who would still like to be helpful when they find an issue.

Just putting the two words 'Complete Catalogue' into the search field isn't really complicated. And surprisingly this search query yields only one result.
Thank you for your report!
However, this issue is a Duplicate of MC-138541.
If you have additional information, please add it to that report.
Please search before reporting, as it's likely that one exists already.
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