Affects Version/s: Minecraft 18w50a
Fix Version/s: None
Environment:Newest Java Snapshot
Running on Windows 10
When I tamed a donkey in my survival world, I got the achievement 'A Complete Catalogue' (also nice pun) Which states to get it, you need to have all of the cat variants. I tested this out in my bug testing world and it can be easily reproduced.
Steps to Reproduce:
1. Spawn a donkey (horses also work too after more testing)
2. Tame it.
3. You should get the achievement. (You can re-do this experiment by doing /advancement revoke @p everything