When I try to do the achievement for buying 100,000 5 card packs, it doesn't let me buy 100,000 but it lets me buy max. I had 3 million coins and bought max of the 200 coin packs but it didn't give me the achievement.
I think there should be a way for you to know if you have gotten all the cards in a tier. Maybe something like a collection and how many times you have gotten the card.
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There's a ton of em posted on the Discord at https://discord.gg/M3xxsB4