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I've been trying to get full
I've been trying to get full Scout armor for so long now. And like many people I was frustrated when I didn't get the shoulder pieces by mining a Brute chopper in Tsavo Highway. So I hopped online and did some searching, and apparently Mongoose Mayhem is in fact the achievement you need to get for the Scout shoulder pieces. This needs to be corrected in all the guides I've seen so far. Yes, it is an error.
Having spent nearly 4-5 hours waiting for Matchmaking to throw me into Isolation (the ONLY ranked FFA map with a Mongoose on the playlist), I finally manage to mow down someone with a Mongoose and get the achievement. Granted it cost me the game (since it was Oddball) but oh well I got my damn achievement and armor and I'm glad I never have to go through that again.
The sad thing is I've actually already mowed down at least two people in a Mongoose so far, while being a lone driver. But it was a social team skirmish match instead. I don't understand why the achievement wouldn't be given to me if I'm pretty much doing the same thing, except the fact that it wasn't a FFA ranked game. Seems kinda dumb. They need to adjust the playlists a little bit so you can have some reasonable opportunity of making those achievements.