Thanks again, Faethor. I’m sure the good people of Westfall will appreciate the food.
I happened to have a character in Pandaria so checked the fishing achievements there. Your bet was spot on 
Here’s yet another updated list of some of the achievements that people have reported being broken in this thread:
- Stay Classy - FIXED!!!
- Stay Classy sub-achievements, e.g. Classy Worgen, Classy Trolls, Classy Blood Elves - FIXED!!!
- Master Crafter - FIXED! (but with a UI glitch*)
- The Daily Grind - FIXED! (but with a UI glitch*)
- The Pen is Mightier - FIXED! (but with a UI glitch*)
- That’s A Lot Of Bait - FIXED! (but with a UI glitch*)
- Pandaren Angler - FIXED! (but with a UI glitch*)
…
- Guild Cataclysm Dungeon Hero - still needs fix.
…
- Master Pandaria Crafter - still needs fix? To Be Confirmed.
- Guild Classic Dungeonmaster - still needs fix? T.B.C.
- Guild Dungeon Challenges - still needs fix? T.B.C.
- Challenging - still needs fix? T.B.C.
- Dinner Party - still needs fix? T.B.C.
…
Torghast achievement problems:
…
*UI Glitch: if you are tracking these ‘fixed’ achievements as you go, the progress counter (the one that you see in the quest log / objective tracker area of the screen) does not update. That makes you think that whatever you just did was not counted. But, after a little time passes (several minutes?) or when you relog, you realise the achievement counter has progressed. So the actual achievements are working…but with a UI delay glitch.