Those who are motivated by achievement tend to have a particular set of features. The first is that they choose their battles wisely. They are not gamblers when it comes to setting goals and will not set one that is impossible. That being said, they won't be as motivated by a task that can be easily accomplished either. A good example of this would be a seasoned runner who is interested in becoming a long distance runner. Since this person runs already, a 5K race would probably be too easy. On the other hand, a full marathon that is only a month away would be thought of as too difficult