The achievement is probably gonna be an absolute nightmare...The Shadowlands equivalent was fully completable with a single level 50 alt and 10-20k gold.
Does anyone else remember the different "size" (i.e. "quality") fish? And how that meant each kind of fish took up three bag spaces? So with multiple "qualities" of other RM's as well the new RM's will consume an idiotic amount of bag space... what joy.