java version "1.8.0_51"
Java(TM) SE Runtime Environment (build 1.8.0_51-b16)
Java HotSpot(TM) 64-Bit Server VM (build 25.51-b03, mixed mode)
What I expected to happen was...:
I expected to not get the achievement.
What actually happened was...:
I received the "A complete catalog" achievement.
Steps to Reproduce:
1. Start a new world
2. Tame a Donkey
I had not tamed any other mobs at that point. I was in creative mode.