Final answer:
Conscientiousness is the personality characteristic consisting of achievement and dependability, and is a part of the Five Factor Model of personality.
Step-by-step explanation:
The personality characteristic that is comprised of both achievement and dependability is conscientiousness. This trait is a part of the widely recognized Five Factor Model, or the Big Five personality traits, which also includes neuroticism, extroversion, agreeableness, and openness to experience.
Those who score high in conscientiousness are known to show high levels of organization, self-discipline, and goal-directed behavior, making them hardworking and dependable individuals. It has also been shown through numerous studies to correlate positively with academic success.