Some people are having issues with this achievement unlocking and the only thing I can think of is that you must score in the same game that you got injured in. Since you can't just run full speed into the boards this year, your best bet is to turn the injury slider all the way up and then just give the puck to your AI and stand in their way. You are bound to get injured from 1 of the shots eventually. Once you get injured, you will need to try to score before the end of the game. It seems like if you get injured and then score in the next game, it won't count.
Bidz99 found a more consistent method to getting injured.
I turned penalties off and then kept getting in fights and losing intentionally. After about three fights, my guy came back on the ice with a protective shield for his jaw, signifying that he was injured. After this occurred, I scored in the same game and got the achievement.