I found a lot of controversy about this achievement as well as with the ‘Overwhelming Power’ and ‘Birth of Oni’ achievements. Here’s how to fight against Gouken:
- Never lose a round
- 10 First Hits (for 3 rounds match)
- 5 First Hits (for 1 round match)
- AT LEAST 5 Super/Ultra finishes (for 3 rounds match)
- AT LEAST 3 Super/Ultra finishes (for 1 round match)
- AT LEAST 2 Perfects (for 3 rounds match)
- AT LEAST 1 Perfect (for 1 round match)
To get the achievement you have to fight him and win on the hardest difficulty.
*This works for SSFIV and SSFIV arcade edition.
*If you make LESS Ultra/Super finishes Akuma will show up instead.
*If you finish Seth with an Ultra Oni will show up instead.
*If you want you can switch to the Super Street Fighter IV version on the options menu so you won’t risk fighting Oni or Evil Ryu.
*You CAN use a second controller to save you from a fault by pressing start on the second controller. The ‘Here comes a new challenger’ screen will show up, just beat player 2 and continue from where you left.
Thanx to HiryuMK on: http://www.ps3trophies.org