Just go to Devil's Lair by yourself while patrolling the Cosmodrome. The Devil Walker is really easy to solo and you'll be guaranteed a notch in your bounty. Just kill it, go to orbit, and repeat. The Devil's Lair can be accessed from the Divide.
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Yep that's how I did mine took less than half hour,just use speeder to go past everyone
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did not work for me should have also added that to my previous comment
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I can vouch for this method. It works for sure.