For all games, you can't do a "Fight AI" game from the single player tab. You must go to Multiplayer, click create a game, pick a map to host, set the game type to "Melee", add AI's, set them all to insane. Doing this on insane also completes the lower-AI achievements.
Map Megaton:
You're Terran & 3 Insane Terrans vs 4 Insane Zerg
-When you spawn, your team has 2 members in the front and 2 in the back. If you aren't in the back of the base, quit and restart so that you are in the back near the corner of the map.Computers can defend much better than you can.
-Very easy, just build 3-4 barracks and make marines/marauders & stim pack. The enemy will try to win early with roaches. Once your allies get a bunch of marines/marauders/medvacs, the zerg don't have a chance.
Map Abyss:
You're Protoss & 3 Insane Protoss vs 4 Insane Terran
-When you spawn, your team of 4 is in a line. If you are one of the two on the outside, quit and restart so that you are one of the two on the inside. Computers can defend much better than you can.
-Very easy, just build void rays and harass the backs of a few different enemy bases, it messes up the AI pretty good. Try to retreat before losing one, you don't need to kill anything, just attacking buildings will mess up enemy strategy and your allies will have an easy fight.
Map Abyss:
You're Zerg & 3 Insane Zerg vs 4 Insane Protoss
-When you spawn, your team of 4 is in a line. If you are one of the two on the outside, quit and restart so that you are one of the two on the inside. Computers can defend much better than you can.
-You have to do most of the work in this match up but it is simple to do. Build up to about 24 drones, harvest 100 gas to research zergling speed and then stop getting gas for the rest of the game. Make a 2nd hatchery & 2 queens, then spawn nothing but zerglings & overlords the rest of the game.
-As soon as you have your first batch of 10+ zerglings, you need to get to any enemy nexus. Look for one of the enemy that has its forces fighting in the middle of the map or attacking an ally, and send the lings straight to his nexus. Attack the probes first, but once they start running just attack the nexus. You may get lucky and take the nexus down, but not required.
-With 2 hatcheries & 2 queens, you should be making batches of 20+ zerglings. Each time you have a batch, pick an empty enemy base and send the lings to the nexus. Kill many probes, then just attack the nexus. If there are only a few enemy units you can go ahead and kill them after the probes, but you should be using your upgraded speedlings to run past all enemies, the zealots are much to slow to stop you and take a while to return, this distraction helps your allies a lot.
-Before you get the first nexus down, one of your allies could die. As long as you keep taking out probes & a nexus with each batch of zerglings, you will still win.
So with this you have both the "win as 4 of each race" achievements and the "defeat 4 of each race" achievements.
I did not write this, all credits go to VirtualEconomist

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