According to psychology, our behavior is motivated by different things and we all have different motivations for our behaviors. Therefore, two individuals can have the same behavior but be motivated by different factors.
One of the needs is the need for achievement and it refers to the desire to achieve a significant accomplishment and showing high-standards in a task by mastering the skills needed to do this task. In other words, it's the need to accomplish a task that is perceived as difficult.
In this example, Rodrigo enjoys being able to complete a difficult job successfully and accomplishing tasks which require skill and effort. We can see that he feels the need to accomplish a task that are perceived by himself (or others) as difficult by mastering skills. Therefore, we can see that he is motivated by Achievement needs.
