Ben-Hur

Using this pure "accidental" glitch demonstrated in the video below will for some reason net you this and "Mercury's Touch" in less than a feet. The less of your life you waste on this mess, the better.

https://m.youtube.com/watch?v=xTc40INym94

Thanks to CATigerman for providing steps!
"When you wreck you pause the game, then quit, select new race and it will be glitched."

Also worth noting, it seems that have you have to lose a bit of your health before crashing for this to work, in other words don't just ram toward the wall the first you do.

I couldn't get the other guys method of the glitch to work.

All you need to do is pause the game a second before you hit a wall. If done correctly you'll feel your controller rumble.
I'm able to replicate this 100% of the time.

I couldn't do it there method one time in 45 minutes.

No you don't need to take damage.

There are 3 ways to earn this achievement, two glitches which are the easiest and the legitimate way.It may take multiple attempts to activate these glitches don't give up after a couple of tries.

Exploit 1
As soon as the race starts head towards the wall and about 1 second before hitting the wall press Pause. If you have timed it right your controller vibrate.

Exploit 2
As soon as you start the first race, run over the obstacle to decrease your health then smash into the first wall.

Pause as your rider is mid air then Select Quit

Go to Start A New Race

If successful you will notice that the Count Down Timer is in now in slow motion and when the race begins you will automatically slam into the gates

If when you start the new race the count down timer is not in slow motion then the glitch hasn't worked.

Legitimate Way
Select a race, health potions are thrown from the crowd when your healths drops out of the green zone. in order for the track not to get littered with these potions keep your health as high as possible. Therefore instead of choosing one of the hectic short races, where everyone is smashing into each other. Select a longer race, stay out of fray as much as you can, and time your corners so you you aren't hitting the walls.

It will take a mixture of practice, luck and good timing.

Normally i do not condone using glitches, but when a game this bad is released the quicker it can be completed then the quicker it can be uninstalled and hidden from view forever

For this achievement, if you don't want to try the "glitch" method or it doesn't want to work for you.. I spent like 10 minutes resetting to try the glitch. Just play the first race and win, skipping the few potions thrown from the crowd. (Health Potions are only thrown when you're low on health. So if you're still in green, you don't have to worry.) Took me less than 2 minutes than constant resetting. Lol
Start up the race. The first one being only 2 laps. I was keeping an even pace using the boost and passing the other chariots. By lap 2 in the last corner, mash the boost button and pass everyone for your 150G.