Didn't Get To Second Base

Didn't Get To Second Base is an achievement in Halo Wars that is unlocked when the player does not claim an extra base on Reactor.

It is worth 5 Gamerpoints.

Tips
Play on Easy and activate the Sugar Cookies, Pain Train, Bountiful Harvest and Emperor skulls.

Make Vultures and destroy every Covenant Base. Bring the Elephant up the ramps to end the level.

Simply don't purchase another base. Very simple.