Finish on the winning team in any Hockey level, having only scored due to opponents own-goals
The guide for this achievement reads:
*This achievement is over xbox live* Having your lobby filled with human players, as soon as the game starts have one of your opponents knock it into his goal, then let time expire.
While this is the easiest way, this achievement can be done without xbox live. I did it in the tournament mode, just using the other players to ricochet the puck off of.