Halo 3 TWO FOR ONE & MONGOOSE MOWDOWN Achievement?

Games Other Halo
1

Hey, guys. Does anyone want to complete these two achievements? Gamertag: TheProBenji
<ul class=“row row-2 achievements–xbox360”><li data-achievement-id=“44”>MONGOOSE MOWDOWNSplatter an enemy with the mongoose in a ranked free for all playlist (Online).
G 5 This achievement usually unlocks the Scout Armor shoulder piece for Spartans.
<ul class=“row row-2 achievements–xbox360”><li data-achievement-id=“34”>TWO FOR ONEScore a Double Kill with a single spartan laser shot in a ranked free for all playlist (Online).
G 5
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2

Lol what a mess!
MONGOOSE MOWDOWN Splatter an enemy with the mongoose in a ranked free for all playlist (Online).
G 5 This achievement usually unlocks the Scout Armor shoulder piece for Spartans.

TWO FOR ONEScore a Double Kill with a single spartan laser shot in a ranked free for all playlist (Online).
G 5

3

Did you get to do it?

I’d be down

4

That would be rather hard to do since you can only run ffa playlist solo.