Re: PoP achievement
If you have done the trade quests, with Aid Grimel, for the ear item
( Signet of the Arcane or Signet of Might) , i found that flag to be missing. I had completed it back in the day when PoP was the current live content.
Councilman Taldarius
(the robed guy besides AG up in the PoK library tower), is for turn in conversion. Taking caster -> melee , or, melee -> caster of the ear item. If you do that, then the Aid Grimel achievement is populated as done.
I felt this was important, as it's a step stone towards the Artisan's Prize tasks.
I did that very thing a little time ago, as I was reading into the AP, and didn't wish to re-do all the work if it wasn't necessary. Up the tower, gave my earing, got the other earring handed back, and the achievement in the journal.
As a side comment, I do not know if there is similar for SoL - Quests - Earring of Solstice, as I hadn't done that before and did that fresh and got the achievement.
Whilst it's heavy on the tradeskills, I think it's significantly easier to redo than the PoP quest, with less farming.
Regards and Best Wishes