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Gamerscore: 100
Achievement Description: Complete all three campaigns on 'Hard' difficulty

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Most likely an achievement which will cause some bald heads if you don't know the strategy for some missions. Regarding a rough mission guide please check the corresponding mission achievements. You will face bigger waves of enemies in shorter intervals on Hard, so be prepared to build quick and efficient.
Here are some general points you should consider:
- Save regularly if you managed to get a hold in the mission. Especially after the intro cutscene for the mission is over as they are not skippable and get on the nerves.
- Turtle, which means playing defense by building a lot of turrets, Shield Generators, and supporting them with Engineers to repair them. Some missions can't be beaten if you build turrets as the first step before anything else.
- Sometimes one shield is simply not enough so place 2 or more Generators near your turrets so that the second shield takes the damage after the first fails.
- Research upgraded Mass Income, Shield Generators and anything that helps your turrets first. Also reclaim wreckage for some extra Mass. Some missions will be impossible on Hard if you don't do this. So put an Engineer near the turret emplacements or order them on a patrol route.
- Complete the secondary objectives as they make your life easier and the boost of Research Points help.
- Find and destroy Tech Caches as they provide you with 3 RP if you destroy them.
- Support your factories each with 3 Engineers (you can't assign more) to ensure fastest Production at all times.
- Don't bother with small assaults like the AI does all the time. Instead aim for overrunning them with Experimentals or a large force of bombers (50-100) to kill the enemy ACUs
- If you don't build Experimentals you only need 4 Energy Generators.