FFX: Chocobo Master Achievement
FFX: Chocobo Master15
Get 5 treasure chests during the Chocobo Race at Remiem Temple and win the race
This can be done at the same time you're here for the "Delta Attack!" achievement, or you can come back whenever you'd like. As far as the race goes, there are more than five chests available during the race, but five specific ones seem to be the easiest to get to minimize running into other players or walls.
Stay straight on the first path to grab one up ahead, then take the ramp to the right twice in a row grabbing the chests behind and in front of the ramp, then stay straight for a fourth and finally use a ramp going up backwards just past the fourth chest to get a fifth. From there, you will jump down right before the finish line and should have just enough time to cut off the other chocobo for the win. Watch the video below for this in action.