Im very fortunate to get 1000G in this game. The achievements arent really that hard, it just takes ages. You will have more trouble getting the Dojo stages achievements though compared to the arcade ones, for those ones you just set it to very easy, 1 round and 15 secs - you should fly though those. My total completion time for the Quest Mode was about 20 hours and my fight record was 1134 wins and 106 losses. If youre getting the game, i wish you well. If you already have the game, dont give up yet. Its not impossible...
100,000 Gamerscore reached 27/04/2011