Encontre esto para la gente que va justo de oro, por si no lo sabiais ya.
Win 100 games in any mode. (300g)
Win 1000 games in any mode. (300g)
Level each available hero to level 10. (200g)
Unlock every Hero. (100g)
Defeat every Expert AI Hero. (100g)
Collect every card in the Basic Set. (100g)
Collect every card in the Expert Set. (100g)