You can try them on old alts that played BFA but new alts formed after BFA must unlock WQ’s each alt and that is tons of work per alt. Only 8% of the population earned the achievements for first and second according to wowhead. If that is your definition of doable then yeah sure. 2/3 achievements were problematic then and now the third achievement that must be done in 20 sec is problomatic due to players being level 80 and cant hold aggro to group up 40 or more mobs.
To put it nicley, these 3 achievement’s are a mess
AFAIK all you have to do is the intro and maybe a simple turn in quest from Nathanos (horde) to unlock WQs for alts.
Alliance will have a more difficult time getting to Nazmir
Also some achievements require World quests which are only sometimes available during assaults in specific zones. Lovely.
Just like the Shadowlands and DF metas, there are achievements that require waiting for specific assaults.
In Shadowlands it’s the Maw Assaults, in DF it’s the Primal Storms.
I didn’t say they were easy. I said they were doable.
I also advise reading the wowhead comments because there are a lot of good bits of advice there.
I also practiced on my remix alts and getting access to BFA quests took about 20 minutes each. I wanted it done so I took the time.