Turok's "Grab Bag" achievement has earned itself the crown of being the worst achievement of all time.
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Why? The achievement description reads Kill at least 1 creature, 1 enemy, 1 teammate, and yourself in the same round of a public match. Wonderful. A whole 10 gamerpoints goes to the incredibly skilled player who manages to fire a rocket launcher at the side of his team-mate's head while he's trying to snipe.
So if you find yourself being stabbed in the back for no rhyme or reason during a public match, don't blame that player. Blame Turok.