Imo they should just hide that hole achivement thing until it is fixed.
I'd keep just personal and event achiventsand make a separate subsection at the bottom of page for them and only show the ones the player has. Don't fill it with junk like clan league achivements and lama and pony that you can't get anymore.

As other achivements that are obtainable by anyone here is a list:

1. Some rank related achivements that are realistic to the player base and work
2. All color full set achivements that work and are not binded by packs or other random items
3. Belt achivements ofc witch reward untradable belt item in-game of the color of the belt you are
4. Some mod achivents. I think the 1000 games/mod is sufficient. Mods imo should be Aikido or abd, judo or judofrac, tk or some other tk mod, lenshu_3ng ofc, wushu?, mushu-boxshu, ninjutsu maybe...idk. At least 5 based pro mods.
5. Some decap achivements. 25 - 50 - 100 with 2 months refresh...or idk how they were designed to work... and career decap achivements 500 - 1000 - 5000 - 10000 career decaps
This should only work in official rooms or certain mods
6. The collectibles achivements... i'd give them a no go but if more are made it would give collectible items more value and they would be more desired. So either get them out or make more
7. Make 1 name change achivement
8. Some sp uke achivements - decap, split, 4 - 6 -8 - 10 - full dm in some designated special mod and certain ammount of frames...mabe speed and altitude related achivement
9. Upload your first head - just for fun, one of the first you get
10. be in a clan
11. stay loyal to a clan for 1 - 2 - 3 years
12. Make history - legend status
13. achivements for staff position - at the bottom of page nicely ordered past and present
14. get banned and permaban achivements
15. Points career achivements - big numbers 1000 000, 10 000 000, 50 000 000, 1billion points scored
16.Achivement for every year spent in the comunity maybe...