The remedy for breach of contract is a lawsuit. Se a lawyer experienced in business litigation to advise and represent you. If you cannot find one, I would be glad to assist with a referral.
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Sounds like a breach of contract.
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Does your bonus letter specify how much you would be paid or how it would be calculated? What does "successfully" complete mean? Are there any qualitative or quantitative measurements for this condition? Are there any other conditions linked to the payment of the bonus? For example, a favorable performance evaluation or profitablility of the company as a whole? These are just a few of the questions to answer to determine 1) are there enough details in the offer letter to create a binding obligation and 2) have all conditions been met to obligate your boss to pay the bonus. A lawyer can help you evaluate all of this. In the end, either you must convince your boss that he is obligated to pay or you can consult with a lawyer about filing a lawsuit to try to collect the bonus in court.