So I tamed a horse in the latest snapshot(18w50a) and i got 2 achievements: the one you get for taming an animal and the one you get for taming all 9 types of cats.... yeah...
That's Probably a bug.
Related issues
duplicates
Comments
migrated
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.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki