Always get Legendary weapons:
Find a weapon box or container and remain idle at least four real time hours next to it. Open the container to claim a Legendary weapon.
Easy "Twins" achievement or trophy:
There are twin zombies at the Pinai Ferry Station that must be killed. The first twin can be found at the beach to the north of the ferry station. It will appear from the lifeguard's shack on the beach. After killing it, go to the billboard with the pick-up truck on top of it at south section of the ferry station. Go to the back of the billboard and climb up the ladder. You can collect sniper rifle and bait from the truck. While up there, look toward the ocean and notice that the building to the left is open. Throw the bait near the doors to draw out the other twin.