UFC 2009 Undisputed

From the list, probably one of the more boring achievements unless you choose to boost the online part. You must win a majority of the matches by decision. It will definately take away some time, so if you want, you could easily do this achievement in parts. Since a majority of these movies are unlocked by decision achievements, stay conservative throughout the matches. Use  and  to defend and attempt to keep your distance as much as possible. 

Once in the last round, use strong kick combos instead of punching to keep from knocking the opponent out. If you are taken down, time and click and rotate to get out.