Final answer:
Mr. Bujarski is likely motivated to complete a second PhD due to the need for achievement, which is connected to the concept of ambition and the desire to fulfill high personal and professional standards.
Step-by-step explanation:
According to research, the need that encourages Mr. Bujarski to complete a second PhD, so he can add another accomplishment to his already long list is the need for achievement. This concept is grounded in McClelland & Liberman's (1949) work on the need for achievement, which theorizes that this need drives an individual towards accomplishment and performance, demonstrating the motivational aspect of setting and accomplishing goals. Furthermore, Murray et al. (1938) categorized the need for achievement and recognition under the domain of ambition, which encompasses the drive to set and fulfill high personal standards. The completion of a second PhD would significantly demonstrate Mr. Bujarski's ability and commitment to his field, reflecting both personal and professional growth, thereby fulfilling that need for achievement.