If it seems like there aren't any other cards to purchase, make sure to buy all of the available characters and the NPC versions of the mook and boss characters. The playable versions of these characters do not count towards this achievement, but the NPC versions do.
It is recommended to reach Level 20 in multiplayer before making too many purchases in the shop, as at Level 20, you get the highest shop discount of 30%.
This page was last edited on 1 January 2020, at 10:59.
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