From the achievement ‘‘great victory’’ youre supposed to get golden cards up to 5000 wins. It showed tons of golden cards and now the chests have been opened and the cards are not in collection.
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Same, just logged in and the rewards track thing gave me tons of golden cards including god knows how many golden legendaries but it was a hell of a lot, like A LOT!. Yet not a single one in my collection?.. is this a glitch or somehting.
Yeah it seems they should be in the core set thats coming but isnt out yet, atleast those cards I remember getting
So when the core set drops we will have all those cards which i am guessing were rewards for completing the rewards track?. As long as i get them because damn it was pretty much if not the entire set!.. i was like a kid in a sweet shop lol, so many cards and all golden right.
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and many achievements finished even i did not earned them…omg…so many bugs
It also says I have 2 legendaries twice, so I can get 800 dust. But I can’t find which ones are double and I’m scared to dust them blind.
same here tons of golden cards for the 5000 wins and none in the collection 
Can someone at Blizzard explain why this happened?. Also i can’t even see the disenchant button anymore?
same here … got the great victory achievement but no golden cards nothing…
The golden cards that you earn through achievements are part of the Core set.
The Core set will release March 30. Until that day, Core set cards cannot be seen in the collection manager.
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Same here, could find 2 legendary that i got but… one of them is Altruis the outcast which i can’t change for dust cause it’s an uncraftable legendary… So my collection says i have something to craft, but i can’t…
Same here. This is just weird and gives you a worry if they even arrive. It could be nice to have a popup window in game that tells you when all these goldies will land in your collection (If they do?).
Beware - I understand this that you have Core Set version and “original” set version of the card: if you disenchant it and it is dropped from Core Set later, you will have no copy. Plus Core Set version is not disenchantable. Or maybe, I misunderstood your comment, could be 
And these confusing gold cards will become available on March 30 when the actual set rotation happens, as I believe.
its easy to find: go to My Collection, press that blue button, and type in search bar: legendary or epic, then go page after page from class to class and neutral, and look at the bottom cards: you will notice 2x on a legendary or epic cards
Also does anyone know if I got…let’s say a golden Faceless Manipulator from the achievements but already have that. Can I disenchant it for free dust because I will get it with the core set later anyways?
Lazur, cards can be dropped from the Core Set next year, so then, you can lose access to those cards if you disenchant them. Now, if you play Standard only, it does not matter, but it can matter in Wild/Classic/Duels.
Oh right that makes sense 
thank you