This trophy is fairly straightforward. Many will get this naturally just by natural gameplay, but if you want an easy way to get this here it is. Go to the store and buy bronze packs at 400 coins each. 20 packs x 400 coins = 8000 coins total cost, however you can make some money back by selling the players and items you get within the pack off on the marketplace. You also occasionally get coin cards that award 100 coins instantly in a bronze pack, these will further reduce the cost of this trophy.
The quickest way to make money is to play seasons, online or offline, whichever you prefer, and to keep winning division titles and earning promotions. You'll soon rack up enough for this trophy.