 First, achievements are characterized by a process-product structure: all achievements have a process, which culminates in a product. Second, the process of an achievement is difficult. Something must be difficult to some sufficient degree in order to be an achievement; after all, if running a marathon and writing a novel were easy, we wouldn’t be inclined to call them achievements. …[and] for now we will suppose that an activity is difficult just in case it requires effort from the agent engaging in the activity. (Bradford 2013: 205)