Is there a possibility that duo all advancement runs will be a category on the minecraft speedrunning page?

It is a good idea doe. Maybe?

I think that for something like 1.16 all advancements a duo run could probably shave a decent amount of time off the run. For example one person goes biome hunting while the other say does a raid in the village to complete that challenge.

Probably not because people already don't run AAdv solo much

I think the main issue with running AA solos is the time commitment, so with duos/squads, I feel that it could actually improve the number of runners, as it would take a significantly less amount of time to complete if you split the advancements among the squad. It would also be cool to see the routing imo.

would all the runners need to get the advancements or only one or split amongst all players? how hard will that be to track / verify?

The two or more runners would have to obtain all of the achievements between the group. Not everyone would have to get every achievement. That was my idea but it could work either way.

good idea

Regardless of it being a recognised category or not, I would be interested in watching it run.