Step by step:
1 Get bones
2 Tame wolf
3 Look in chat for the advancements.
Environment
What should happen: When taming the wolf you get it as a pet and should give you advancement (Best Friends Forever).
What actually happens: When taming the wolf you get it as a pet and gives you 2 advancements, one named (Best Friends Forever) and (A complete catalogue)
Duplicate of MC-138541. Please use the search function before reporting bugs.