Supreme Commander

Aeon Campaign Complete: Easy

This is not too difficult, but it took me 2-3 hours for every mission(on hard). There is a total of 6 missions. Each one has 3 phases. Everytime you complete a mission the map expands.
You should save every once and a while, I usually saved before finishing a mission, or even attack.
If you beat hard you unlock this achievement too.

Tactics

My tactic as the Aeon was to use the SEA as much as possible. On the final mission you must immediately build up your defense. Use alot of shield generators, which are very nice. Build a naval army as soon as possible as the entire area around you is sea. I recommend working on Tech 3 battleships (beautiful offense and extremely powerful) and immediately build the Flying Experimental bug. When you unlock the strategic Nukes, build a ton of them. If you just nuke like crazy you will hit them. The enemy has a limited amount of Strategic missile defense. As so as you unlock the entire map just nuke the left side of Black sun and you will hit the Lead ACU. Keep a save in case you need to redo the end.