First of all,by samatian do you mean spartan;because I'm not sure I'm all that confident
in your grammar skills? Unless I'm wrong and that's the achievment,then I apologize.

and i was in a rush and stuff so i didn't car to check my grammar you freaking monkey.sow
black 0f u noo8.

To get it, you must kill no engineers in the city at night throughout the entire campaign.
If you've killed one I think you have to restart the campaign to get it. There is also
that one for killing ten engineers in the city. Engineers are the strange floating things
like the one you save at the end of the campaign.

I'M THE NOOB,I'M SICK AT HALO.

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Their is a glitch so that if you have a friend who hasn't killed them and you get past the
point of where you get the achievement with them and you just joined 7/8ths through the
campaign. I got it just because I played the last level with my freind who hadn't killed
any even though I killed 4 of them by myself