On Thursday patch 20.0 will launch (whatever time they announce maintenance) and at that point the Dakmoon faire achievements will stop giving XP.
For the most part they’re not worth going out of your way to get, as the XP offered is so low (I had fun getting some of them to be fair), but if you’re a game or 2 away, it might be worth your time to get them.
For instance I’d played 491 corrupted minions so I finished that off just now, but I’m not gona bother getting the 19 Bola shot kills, 9 opponent drawing bananas or ones i need rng for.
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Well, I’ve enjoyed doing XP-rewarding achievements a lot 
Of course, there are exceptions requiring some special condition like killing the opponent from full health with C’thun or getting a win from Yogg-saron which I just not felt grinding for But most of them, I’ve finished before the end of 2020 I guess.
Btw. according to https://playhearthstone.com/en-us/news/23642550/20-0-patch-notes, the new achievements (for Barrens) will become active on March 25. Not sure it is a good thing. I think I would like to save the most XP for the new rewards track, but I believe, the track starts on March 30, right? Will have to be carefull with those
You can’t use any Barrons cards until the 30th, so you should be safe on that 
Well, they can be in Duel buckets and Duels rotate on 25th. Or at least that is how I understand this:
Forged in the Barrens cards can be found in card buckets offered between matches in Duels before the expansion unlocks on March 30!
And in addition, I think there were achievements in Darkmoon completable using non-Darkmoon cards, like Hunter controlling 3 identical deathrattle minions. Maybe, there will be similar ones in Barrens.
Ah that’s true, guess we’ll have to see
You can just not hit the collect button 