I am afraid you won’t get someone to personally come change things for your account. That is not a service Blizzard offers, with rare exceptions if the Devs approve it.
I looked up your Achievement you mentioned. Fisherfriend of the Isles
While you can still do the achievement, the ability to use the colors no longer works after the Dragonflight fishing changes.
Here is the top comment on Wowhead talking about it.
22 By DerpyChinchilla (1,482 – 3·12) on 2024/03/01 (Patch 10.2.5)
A warning for anyone deciding to work on this chivie in 2024 for their legion fishing pole - Since the change to profession tools brought with Dragonflight, the color changes for the legion fishing artifact - Underlight Angler - do NOT work.
I cant pretend I know WHY. I simply can tell you I wasted 2 to 4 hours a day for 6 days, working on this chivie specifically for the color options on said fishing pole.
I found a forum post in the bug section from 2022 talking about it with no resolutions given.So- Work on it if you want to huff copium that they might randomly fix it someday.
Otherwise, don’t waste your time unless you want the fancy bobbers. Cause that’s the only solace you will receive in finishing this achievement now.-March 2024.
PS - Here’s the forum post for anyone that wants to necro the post like I did. Hopefully if enough people bring it up, they might slap in a fix for it.
Fisherfriend of the Isles Underlight Angler cosmetic now missing with Dragonflight tool changes - #5 by Drokahr-illidan
This was reported as a “bug” back in 2022 but it may actually not be a bug so much as something they don’t plan to fix with the new fishing gear changes. I have not come across any Dev comments one way or another.