Ok, I've still had about enough of this challenge. I thought I'd try again after the patch that toned down the Terminator Bots from earlier, but I see that it forgot about this challenge. The AI here still murders and spams turrets, and they come out faster than I can kill them. This is the only 3-Star challenge i have left to do, and I'm getting frustrated as hell here.

How exactly does one complete this challenge?

You don't have to do it unless for the achievement.

Just be tactical, also challenges are much more easy at a lower level.

before you repair the bot go plant some mines, get a turret ready, i did it with ease 1st time this way, Lobster helps aswell

Not sure if I've completed this one. I just use it to test out weapons. I might be able to help, as this may be the reason I haven't got the 'King of the World' achievement yet.