Play exhibition game against someone **** (20 mins games prob best) on world class. Go into settings when game has started & change yours & computers settings. You can make yourself more powerful & quicker, the computer slower & make the com play a high line (as well ad others). Do this a couple of times & you will have achieved the majority of the achievements.
No probs. Just found out the settings stay the same whether it's exhibition or your career. Gone from a 78 striker to an 86 in a couple of games.
I havnt got fifa12 but cant you just change the stats of your players anyway, pretty sure HMT was anal about it on his toon team on their gaming thread, and was changing his players stats to suit what they were like in real life.