Did some testing with my saves tonight. I'm on PS4 and have confirmed all cards per gwentcards . com
Approximate deck building history:
-Earned 4th PFI early on, it's the only extra card I have and perhaps what glitched my trophy
-Played randoms, interleaving gwent related quests
-Purchased all the cards from Merchants, including the Griffin merchant (Did NOT pick up the cards from the inkeep in the prologue)
-Did the Tournament during Triss' secondary questline to get Dandelion
-More randoms
-1.07 upgrade
-Did the High Stakes quest and completed it
-Completed the rest of the one-off specials and finally the Skellige style quest
-At that point it was randoms to complete the collection. I received all of the cards except Imlerith and Wyvern. I can get both, but no achievement. So far my testing has shown I draw Imlerith first always.
I only have one question: Should I preserve a save where I don't have all the cards and wait for a patch, or am I going to be GTG continuing with one of my newer saves?
Thanks. Hope this information is helpful.