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Gamerscore: 50
Achievement Description: Play the game for over 24 hours in total

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Map - Coalition command center 3v1
Type - Supremacy
Rush timer - 5
Add 1 easy AI

This is the best map as there is so many mass deposits, just destroy the AI base but make sure you leave 1 building so the game doesn't finish. Build on all the mass deposits then upgrade your mass income. You will be getting about 100 mass every second which works out at 6000 a min, it will take around 3 hours, not long at all. you can also just leave the game running which all goes towards your 24 hours played.

Make sure you finish the game and don't quit or nothing will count.

Now for the "Sharp Shooter" and "Master Builder" achievements:

There is 2 ways to do this. If you have a boosting partner this is the quickest way to get these achievements.

Start a ranked match or multiplayer match and build 10 or more air pads,then have your boosting partner build 2 anti-air at each of your air pads. Then your boosting partner shoud build 10 or more air pads and you build 2 anti-air at each of his air pads. Now all you have to do is keep building wasps from all of the air pads, they will be destroyed as soon as they are built.

If you don't have anyone to boost with this is what I did.
Start a skirmish match with these settings.

Map - Coalition command center 3v1
Type - Supremacy
Rush timer - 20min to set up enough defenses
Add 3 easy AI and make sure they are all on team 2 and you are at location A.
UEF recommended

Before you start Don't build land units or artillery, the land units are too slow and the artillery will destroy the AI.

As soon as you start you should upgrade your structures in this order: Build cost, Build timer, to start with. Then build 4 research stations around the outside of the 4 mass deposits, then build the 4 extractors. Keep building research stations all around the outside in a square, 20 -30 will do.

You should be getting plenty of tech points and you need to makes sure you have these researched before the rush timer is up; Radar, than Fortified artillery, Gauss cannon, Linked railgun anti-air, Health, Shield generator, then try to upgrade the Structures training ASAP.

Build 2 shield generators and 2 anti air in each corner of your base and 2 shield generators in the middle, now your base is nearly untouchable. make sure you build anti nuke defenses and don't forget to keep them well stocked, if you forget they will nuke you after a hour or so. They are also handy as nuke defense silos and nukes are also auto short range artillery. Build your power stations near your important structures cause as soon as you research Engineering Tower all your power stations auto repair or finish building structures for you.

Your base will be untouchable to anything they send at you and you will be getting loads of kills without building any units at all. Now all you have to do is build as many air pads as you like and keep building wasps. you can either set a way point to each or the AI bases or you can nuke your own units, the choice is yours.

After 45 mins. or so they will start sending 20 or so land units at a time but don't worry your base will take care of them. But if you are worried build a few fortified artillery at the front of your base.

Using this method I was able to build 4000+ units and get 1800+ kills every 2 hours. Just don't forget to finish the game or nothing will count.

Once you are done with everything except "Time Cruncher", destroy everything but 1 Mass Extractor or Power Station and leave the game running over night.