After using the breach of time spell as part of the story you will unlock the cassino at tombstone trail where you can win/buy chips and trade them for prizes.
For this trophy you need to buy all four of the top tier prizes.
A good way to get this without wasting your Chips/money is having 360.000,00 guilders (which os the amount you need) make a backup save, exchange all for chips, exchange the prizes and load your save.