Start game
?
Choose Ghosts & Goblins
Change controls to make "insert coin" X instead of R3
Load a coin into the machine while mashing the X button
Get to the intro cut scene in the graveyard and hit start and go to "reset game"
Insert coin again...etc.
Repeat 999 times for a bronze trophy.
Feel special?
There is a tracker in the "Triumphs" screen