Synonyms for Fulfilled:
General:
* Satisfied
* Content
* Happy
* Complete
* At peace
* Accomplished
* Realized
* Achieved
* Successful
* Gratified
* Pleased
* Glad
* Joyful
* Contented
More specific:
* In terms of goals:
* Achieved
* Attained
* Realized
* Accomplished
* In terms of desires:
* Satisfied
* Gratified
* Content
* In terms of purpose:
* Meaningful
* Significant
* Purposeful
* In terms of relationships:
* Loved
* Connected
* Close
Less formal:
* Happy as a clam
* On top of the world
* Feeling great
The best synonym for "fulfilled" depends on the context and the specific meaning you want to convey.