NHL 12
45 Achievements
1,000
A Smash Hit
Break a pane of glass with a hit on a CPU player
10
How to unlock the A Smash Hit achievement in NHL 12 - Definitive Guide
I assume it would be easier with a big guy like Chara or Pronger but I got it with Jeremy Roenick so take that for what it's worth guys.
This is one is tricky and random. You are going to try and wait for a CPU player be near or coming along the boards, and you are going to be charging for a hit with the to hit the CPU player. You can also try after an icing call as sometimes the CPU will stop near the glass, and then just charge into the CPU. This will take many tries. Even if you have the tallest player, you still might not break the glass. The video below shows an example.
This is just one of those achievements you will get over the course of playing the game. I spent hours crushing the AI with players that had maxed out attributes, weight, and height and I finally got it in a Be A Pro with my medium sized power forward. It seems that this is a random event because my hit wasn't even that big. It also seems more likely to break the glass if the AI's shoulder hits the glass. They shouldn't be facing directly toward or away from the glass.