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I wouldn't say I was actively aiming for these achievements. I stuck with Mondstadt for awhile since their commissions are pretty fast to complete. I'll probably switch to Sumeru for a change of pace.After you do all the mailbox treasure map stuff, you unlock a room full of chests. Every 5 Aranara you find opens a new chest. I have 3 chests left, so I have somewhere around ~15 left to find. Nothing official that tracks it as far as I know.
Man, I don't even bother for all that work for 5 primogems. I didn't know that Anna becomes an adventurer though, I thought her story ended after she climbed the windmill. I still have 2 achievement categories related to Mondstadt/Lyue dailies, but there's no way I'm going to actively aim for those. Sumeru's comissions have been kinda a let down, other than the jumping/light chasing ones which are kinda fun.
For the Anna commission string, after curing her, you need to get commissions from her brother to find her in a couple of hard to reach spots in Mondstadt. Once you finish those, she joins the Adventurers' Guild as a trainee and you get a couple commissions to help her train. Finally, you accompany her on a her first job, which is escorting a slime balloon, and this triggers an achievement.
Thanks to commission RNG BS, last week I received Anna's slime balloon commission 3 days in a row. The text does change and Anna seems concerned about getting the same commission again, & the Traveler is like "Yeah, about that....". Apparently there is also a version of her commission where you encounter Fischl & Bennett, but I haven't seen that.