1 Gold Medal won, 86 to go...

 "Obtain your first gold medal in the original Wipeout HD Race Campaign."

This trophy is very easy to obtain, and as stated in the description, you will obtain it the first time you obtain a gold medal in any event of the Wipeout HD Campaign.

If for some reason you are having difficulty, turn the difficulty to novice, and continuously race the speed lap in the uplift event until you get the gold.

The trophy's class is bronze.