Here is the full list of all 12 Horse Riding - Breakthrough Gaming Arcade trophies - there are 11 gold and 1 platinum.
You got all the trophies! Congratulations!
Ride to level 6
Ride a distance of 8000
Ride a distance of 7000
Ride to level 4
Ride a distance of 6000
Ride a distance of 5000
Ride a distance of 4000
Ride a distance of 3000
Ride to level 2
Ride a distance of 2000
Ride a distance of 1000