Achievment: 64 Bit Armies

[Raubhamster]

64 Bit Armies: Win a skirmish or multiplayer game vs. 6 hard AIs.

I'm not sure if this is intended or not but there is an easy way to get it:

Start a skirmish with an insane AI in your team and put the 6 hard armies in different teams.
Then relax and wait.

[hendronimus]

You dont even need an AI in your team, can just wait for them to kill each other

[Kai]

I had 4 normal AI vs 2 insane AI, they were holding each other at bay and the insane AI nearly wiped out a normal AI's base, but all four AI at this point (several minutes in) has a modest sized army already.

[s2banks]

1v7 allied insane AI should be an achievement >D