This achievement is part of the "Breakdown" DLC bundled with State of Decay: Year One Survival Edition. To reach Level 2, you'll get a mission called "Gotta be a way out..." where you'll have to locate an RV. Once you've located this RV, refuelling is required - for this, you need 25 "fuel" resources. Each "rucksack" of fuel gives you +5, so you'll need to get a total of 5 rucksacks to get enough fuel to fix up the RV. Head to the "Home" menu and in the bottom left you'll see the menu to refuel the RV. Press
once to refuel the truck. NOTE:Do not press
again if you have unfinished business here. Pressing
again will make you "escape" which will make you lose all challenge progress and end the level. When you've ironed out all your unfinished business, feel free to escape - you'll then unlock the achievement.