Hint completion
I suspect there’s a bug with the hint completion system, rather than specific hints because a lot of people seem to get the same problem with different hints.
For this one all I can suggest is send a bug report to Anet with a screenshot showing your achievement points/next chest and the uncompleted hint.
Hopefully sooner or later you’ll get it. That’s what happened to me with the mail one. I just kept my mail box close to full so it kept filling up and then randomly one of those times it actually triggered the hint.
Danielle Aurorel, Dear Dragon We Got Your Cookies [Nom], Desolation (EU).
“Life’s a journey, not a destination.”
“Life’s a journey, not a destination.”
Hint completion has been bugged since launch for many players.