Days Gone

Complete New Game+ on any difficulty. If you have gone for the normal run first and survival II second then Surviving is Living for a guide to survival mode. To make this quicker, as the game itself is lengthy. Just go after the yellow story missions as these are the main story progression. Because you will have a high reputation for all camps it won't take long for the next main mission to spawn. You may have to ride out of the camp for a little while to get the job radioed through but doing so will save you half the time.