Board Thread:Support Requests - Community Management/@comment-31673189-20170405160534/@comment-168424-20170421222927

That's not quite right. Fandom has already effectively deprecated Achievements, so they won't support it (fix bugs, answer questions in detail, or help you to get it working right), but it will probably continue to work for some time.

See User_blog:DaNASCAT/Technical_Update:_April_10,_2017.

However, they may soon announce they are removing it and realistically they didn't support it long before they officially talked about deprecating it. Also Help:Achievements does not mention that they deprecated it, which is pretty lame.