For another point, complete everything in SF4's Challenge Mode with Gold Medals. (This bonus point takes a lot of work and honestly isn't worth the time unless you were planning on doing it anyway.)
For a third point, post clips of two Hard Trials completed by inserting something other than a normal attack into the required sequence. Special moves, supers, ultras, Focus Attacks, throws, etc. all count. However, the additional move has to be done after the first move in the sequence and before the last move, so tacking on a super at the end or starting with a jump attack won't qualify.
Here is the text of the the relevant Xbox 360 Achievements:
Xbox 360 wrote:No Challenge Too Hard - 20 G
Achievement Description:
Clear HARD Trial in Challenge Mode.
The Gold Standard - 50 G
Achievement Description:
Earn gold medals in all challenges.