Note: players who’ve already completed the requirements for this achievement previous to it being added to the game will automatically unlock it upon starting or loading any community in the main game (not Heartland).
The Bounty Broker appears at a central location on all of the maps (not Heartland). He appears as a Friendly Enclave (blue colored Castle icon) on your map. It’s easiest to wait until he calls you, as this happens very early during your game, this will make a Quest appear, you can
from your Map screen to make sure you have his quest selected, then grab a car or your running shoes and go there. You can accept up to three bounties at once. Bounties can also be discarded by clicking on any active one, so don’t stress out about choosing the right one. Try to pick 3 where they work together, for example “Kill zombies” and “Kill zombies with blunt weapons” synergize. But regardless, just pick one, as soon as you’ve accepted (not completed) it, the achievement should pop.