Supreme Commander

I found an extremely easy way to get this, To The Grave, Cherry Picking, and Hold Your Own at the same time.
You can actually rush the supreme enemy with your ACU in Assassination matches, and it's lots of fun! My fastest match was around 1.25 minutes real time.
You MUST pick Aeon(best ACU for Commander battles--longest range and best attack), and the enemy CANNOT be Aeon--recommend enemy be Cybran because of lower ACU hitpoints and short range.

Select the skirmish match you need(34 maps total), with Fog set to None and Prebase set to OFF. Set enemy to closest location to yours at the start. Target enemy ACU with your commander and head straight there! On some larger maps, I had to build two Tier 1 turrets just out of range of the enemy ACU, and they would help me take out the base and ACU. Beware, enemy ACU's going critical deal from 500-5000 damage to your ACU. You will survive if you have more than 50% health, but watch out if you are lower!
You can survive most Commander 1v1's without the extra turrets because the AI gets messed up and doesn't target you most of the time--however, sometimes they have time to build some ground units that attack your ACU and things get really messy.... so your turrets come in very handy.
And, that's it! Repeat for each match. It's really funny watching the bad AI run around while it's getting shot at.

And, about the freezing!

If your game was freezing, I recommend making a backup of your game save, then deleting your Supreme Commander profile(ex. "Prefs 12/13/2014 - 5:31:48 pm" Saved game) from the storage directory on your xbox 360. This should help with the freezing, until your new SC profile decides to start freezing.. you should be able to run through all the Assassination maps before it starts freezing again like mine liked to do. It's a good idea to make a save at the end of each map and note down the exact time for the map. As long as you get to the main menu after the game without it freezing, you can be sure it saved.