Here is the full list of all 14 Retro Pixel Racers trophies - there are 2 silver, 11 gold and 1 platinum.
Complete all trophies
First position on race 1
First position on race 3
First position on race 5
First position on race 7
First position on race 9
First position on race 11
First position on race 13
First position on race 15
First position on race 17
First position on race 19
First position on race 21
First position on race 23
First position on race 25