Supreme Commander

For you to actually get this achievement you need to win by the score and not by blowing up the enemy, if you actually win by defeating the enemy it will NOT count.

the fastest way to get this is set up the AI to easy and just dedicate yourself to rush and build a experimental weapon the quickest one to build is the cybran monkeylord. once you have it send it to the hill and wait till you reach your goal

The fastest way I found for this let me get a win on most maps within 8 minutes real time, around 22 minutes average game time on fastest. My fastest win was about 7 minutes, 15 seconds.

There are 26 maps to do, so figure on about 10 minutes per map including loading times once you get the pattern down, so you're looking at about 260 minutes, or 4.5 hours.

What I did was selected a Skirmish map I needed, and these are the important settings:
Unit Cap: 250(to limit the AI)
Fog of War: None
Capture limit: 100,000
Pre-Base: On
Game Speed: Fastest
Spawn: Fixed

Select Cybran Faction, as the goal is to rush a Flying Bug Experimental.
As soon as the match starts, do this general build order, always avoiding running out of energy!
1. Task ACU to assist Land Factory.
2. Immediately upgrade Land Factory to Tier 2, and prebuild 7 Tier 2 Engineers.
3. While waiting for engineers, scan the map for closest Mass and Power locations.
4. Task first 4 engineers in groups of 2 to build up to 8 Mass Extractors each.
5. Task 5th engineer to either build Hydro-carbon Power Plants if available or else 4 Tier 2 Power Generators around a Mass Extractor.
6. 6th Engineer put on patrol around large areas to scavenge mass. 7th engineer either assist building the Power plants, builds power plants, or assists with the patrol for mass.
7. Wait until you have enough energy, then start upgrading the Factory to Tier 3. Pre-build 2 Tier 3 Engineers. Pause the factory if your energy is running low.
8. 1st Tier 3 engineer assist with power plant construction.
9. 2nd Tier 3 engineer begin building Experimental Bug.
10. Assist the Bug with ACU, and Tier 2 engineers as long as it won't run your energy out.
11. Fly bug to middle of map, and save game just in case when capture points reach 90,000+. I noted down the time of the save so I would know which save was which map.

And repeat for 25 more maps! Some maps have no Hydro-Carbon as already mentioned, on those make sure to get Tier 2 Power up quickly. Some maps don't have many resources, so just be careful you don't run out of energy.
The problem with running out of energy is it stops your mass extractors from producing at normal levels!

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 King of the Hill 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.