Here is my guide i did when i was playing xbox on trueachievements.com(i did copy paste)
Didn't want to make a guide for this but, now that i have it done, decided i will give my 2 cents about it.
The reason why is i did it with a controller, with the D-Pad, despite what everyone says IT IS doable, i won't buy a fight stick for just a trophy and i just cannot play fighting games with a joystick on a controller, so this guide is for anyone in the same boat as i was.
The way i did is going through all caracters doing what was possible to do, after that it was moping up time, at that point i kept on changing my button maping to have the buttons all next to each other(no L1/L2/R1/R2) just so combos could be easier to input and it worked perfectly. Makoto and Yun i had to, the timing for their combo 1 and 2 are way to tight to keep button spread all over the controller.
I ain't no pro in street fighters game, need perseverance and patience. there is no practice to do, only to learn the timing right then persevere to get the trial done.
Watch youtube video made from VesperArcade, he as the best video for the reason you see his controller to give you an idea of the timing.(i want no credit from is video, i havent asked him to put is name here but i don't think he would mind, since there is no link, you need to go find them yourself on youtube). In youtube input street fighter 3rd strike ryu trials, and you will see it on top of screen(change the name to which caracter you need help).
Here is the list, stopped at exactly 55 challenge, and won't bother to do more :)
Basic Parrying : 100%
Expert Parrying : 60% (6-7-8)
Handicap Trials : 60% (1-2-3...2 is super hard to do, what i did to beat it was jump backward and when your back on your feet QCF+fierce punch, its a slide/grab attack, then keep on repeating the process and eventually you'll beat chun-li) (QCF=quarter circle forward)
Akuma : 40% (1-2...couldn't do 4 cause in my opinion impossible to input fast enough with a controller)
Alex : 80% (1-2-3-4)
Chun-Li : 40% (1-4)
Dudley : 40% (1-2)
Elena : 40% (1-2)
Hugo : 100%
Ibuki : 60% (1-2-4)
Ken : 40% (1-2...couldn't do 4 cause in my opinion impossible to input fast enough with a controller)
Makoto : 40% (1-2)
Necro : 60% (1-2-4)
Oro : 60% (1-2-4...for #2 to start the combo you need to give the jump kick late, almost before landing and you'll be ok to do the combo)
Q : 40% (1-2)
Remy : 20% (1)
Ryu : 40% (1-2...couldn't do 4 cause in my opinion impossible to input fast enough with a controller)
Sean : 40% (1-2)
Twelve : 40% (1-4)
Urien : 20% (1)
Yang : 40% (1-2)
Yun : 40% (1-2)
I hope this help the hunt, remember to stay calm, if you're getting out of control take a break and go back to it another day.