- gamertag: Methew
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As everyone else is saying. Complete a game from start to finish without killing any Engineers. Speed through on Easy and you should be good.
I don't know about the level just before Data Hive when you play as Buck with the Banshee. I was cautious, not wanting to have to replay the level or the game again, so I didn't kill any Engineers in the Banshee or shoot any on foot. I think I might have shoot one to get him to fly away to get rid of the Overshields on the Covenant.