Rather than using the above solution and hoping your guys don't commit a penalty try this:
1st- Start a Play Now and make sure you set difficulty to Superstar and set time to 5 minutes
2nd- To make sure I didn't go into overtime I immediately pulled the goalie and allowed opponent to score at least one goal
3rd- Gain control of the puck and skate left and right behind your net crossing the red lines before switching directions. If you stand still opponent will come after you, but if you keep moving the AI will simply stand their and do nothing. Simply hold the puck and kill the remaining 15 min.
By controlling the puck yourself you insure that A) Your guys will not commit penalties while your on offense and B) the clock will continue to count down time unstopped making it much faster since you wont have to watch highlights, kill penalties (which slow the clock down to real time), etc.
Got this on my first try using this method, tho there the slightest chance that your team could commit a penalty while AI has control of the puck, if so simply pause the game and choose rematch and start over.
(note I also used my Create a Team with Created Goalie and Player to knock out 3 extra achievements in one game)