It can be said that all subfields and perspectives within psychology have the same goal of: O analyzing how characteristics aided our ancestors.
O describing and explaining behavior and the mind underlying it.
O studying brain circuits that underlie behavior.
O understanding how our interpretation of the environment impacts our experiences.

describing and explaining behavior and the mind underlying it.

Explanation:

Psychology can be defined as the scientific study of both the consciousness and unconsciousness of the human mind such as feelings, emotions and thoughts, so as to understand how it functions and affect human behaviors in contextual terms.

Hence, all subfields, categories and perspectives within psychology have the same goal of analyzing, describing and explaining the behavior of a living organism such as humans and the mind underlying it, so as to have a better understanding of how they function in a given context.

This ultimately implies that, psychology focuses on studying behaviors and the mind that controls it.