Supreme Commander 2

This achievement is awarded for beating the UEF, Cybran and Illuminate campaigns on Normal difficulty. You must complete every mission on Normal and do not change the difficulty.
This should be fairly easy, but a couple of tips if you are having any trouble:
1. Your first step in most missions should be to protect your base, with Point Defense Turrets, Anti-Air Turrets and Shield Generators.
2. Make sure to have a good mix of ground, air and sea units. Also, don't go straight for building experimentals, as the smaller units have some useful abilities.
3. When attacking an enemy, target the turrets and shields first, as they will cause you the most problems.
Also, this achievement is stackable, so you will also get the 'Easy Going' achievement.

Here are videos of all the missions on hard. Completing them on hard also completes them on normal.
Click the link at the top of the videos to watch them on youtube and the next video starts right away.
These include all the objectives. A couple are mutually exclusive so you must replay a few missions twice to get all the objectives.