Another way to say "fulfill your dream"

• achieve one's ambition
• meet your desires
• fulfill your wish / make your wish come true

Looking for a metaphor, one option is:

To describe someone's achievement as a feather in their cap means that it is something they can be proud of. "The overwhelming victory of the team was a feather in the cap for the new manager."

Source: Success/Failure Idioms

Well, the word actualize means to make real. Specifically, self-actualization is a term used by psychological theorists to describe the process by which a person reaches his full potential. There's a subtle difference between fulfilling dreams and reaching max potential, so you could say actualize your aspirations.

Another way to say it would be "to realize your dream".