As stated by Chef James. Once you get into the field join the A.C.F. based on job experience and knowledge you will be granted certifications.
There is no Masters degree in Baking and Pastry but you can reach Master Pastry Chef through the American Culinary Federation. They have certification exams and requirements on their website but the first step would be to get a certificate in Baking and Pastry from a Culinary school or college.Check out and compare baking and Pastry programs near youVisit the American Culinary Federation website
James recommends the following next steps: