I am still hanging around on 1.11.2 and I am looking for a command to open a specific achievement tab. The default commands only allow adding or removing achievements to/from the player.

So a command like:
/betterachievements open "something with tab-completion"
would be extremly helpful. Also it would fit perfectly in this mod.

The reason why this is helpful:
I am working with FTBUtilities to write guides and the 1.11.2 version allows to run commands. So with this it should be possible to open specific achievment tabs as part of a guide.