Of the 20-ish appearances per artifact, I think I can unlock about half of them in SL. (Obviously, Mage Tower appearances are unobtainium. But soloing raids, getting random drops, etc., that’s doable.)
The thing is, I’m wondering what level of account bound they are.
I’m not equipping my artifacts any longer. So am I unlocking all of a class’ artifact appearances for a particular achievement/ milestone? Or just for my current spec?
And (very unlikely), if it’s “all artifacts that apply to an achievement/ milestone,” would that unlock across all classes? (Meta appearances unlocks.)
Simplest way I can put it is this:
You need to unlock every appearance, on every spec, by meeting the requirements for said appearance, at least once. Once you do that it will forevermore be available for transmog on all future characters of that class, and specific spec you wish to mog for.
This transfers between faction as well.
But it must be done at least once on every class and spec you wish to unlock.
Hope that helps.
Good thing I enjoy kicking the bleep out of old content (and that I like Legion content)… 
There is one exception I forgot to mention, sorry:
The PvP related appereances, since they only require honor levels, DO unlock for all classes and specs, when done in a single character, since Honor Levels are account wide. So if your DK did pvp to level 50 for example, but none other has done pvp, you still will have the skins unlocked at the class hall.
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PvP, I don’t see myself doing. I don’t even want to know how much grinding I would have to do to get by LOSING all my matches. (I’m realistic about that. PvPers have the gear and skills to wipe me repeatedly.)
I’ve bookmarked the Wowhead guide on getting appearances.
They’re account bound in the sense that once you unlock it, the appearance will be available on alts of the same class.
If I go do Balance of Power on Shadina (which I have), the Balance of Power skins I have unlocked are unlocked as appearances on an alt priest. They are not unlocked for other classes though unless I go do them for another class, and repeat the process.
Two achievements unlock it for the entire account, which is the Legion Dungeon Hero and This Side Up. Those two things are account bound and break all rules involving class involvement. However, you must do the base appearance quest first.
In other words, I have Legion Dungeon Hero done. All classes will have access to it. But in order to unlock the appearance, I must still do Balance of Power. So if I want the druid kitty form from Legion Dungeon Hero, I can have it on all druids, as long as one of my druids does the Balance of Power quest line.
I’m assuming Dungeon Hero is unobtainium?
dungeon here is the glory achieve from doing all the different legion dungeon achievements. its still obtainable
No it is. Just gotta do the achievement.