Here is a list of all the Merit Badges that you can earn:

American Business merit badge
American Culture merit badge
American Heritage merit badge
American Labor merit badge
Animal Science merit badge
Archaeology merit badge
Archery merit badge
Architecture merit badge
Art merit badge
Astronomy merit badge
Athletics merit badge
Atomic Energy merit badge
Auto Mechanics merit badge
Aviation merit badge
Backpacking merit badge
Basketry merit badge
Bird Study merit badge
Bugling merit badge
Camping merit badge
Canoeing merit badge
Chemistry merit badge
Cinematography merit badge
Citizenship in the Community merit badge
Citizenship in the Nation merit badge
Citizenship in the World merit badge
Climbing merit badge
Coin Collecting merit badge
Collections merit badge
Communications merit badge
Computers merit badge
Cooking merit badge
Crime Prevention merit badge
Cycling merit badge
Dentistry merit badge
Disabilities Awareness merit badge
Dog Care merit badge
Drafting merit badge
Electricity merit badge
Electronics merit badge
Emergency Preparedness merit badge
Energy merit badge
Engineering merit badge
Entrepreneurship merit badge
Environmental Science merit badge
Family Life merit badge
Farm Mechanics merit badge
Fingerprinting merit badge
Fire Safety merit badge
First Aid merit badge
Fish and Wildlife Management merit badge
Fishing merit badge
Fly Fishing merit badge
Forestry merit badge
Gardening merit badge
Genealogy merit badge
Geology merit badge
Golf merit badge
Graphic Arts merit badge
Hiking merit badge
Home Repairs merit badge
Horsemanship merit badge
Indian Lore merit badge
Insect Study merit badge
Journalism merit badge
Landscape Architecture merit badge
Law merit badge
Leatherwork merit badge
Lifesaving merit badge
Mammal Study merit badge
Medicine merit badge
Metalwork merit badge
Model Design and Building merit badge
Motorboating merit badge
Music merit badge
Nature merit badge
Oceanography merit badge
Orienteering
Painting merit badge
Personal Fitness merit badge
Personal Management merit badge
Pets merit badge
Photography merit badge
Pioneering merit badge
Plant Science merit badge
Plumbing merit badge
Pottery merit badge
Public Health merit badge
Public Speaking merit badge
Pulp and Paper merit badge
Radio merit badge
Railroading merit badge
Reading merit badge
Reptile and Amphibian Study merit badge
Rifle Shooting merit badge
Rowing merit badge
Safety merit badge
Salesmanship merit badge
Scholarship merit badge
Sculpture merit badge
Shotgun Shooting merit badge
Skating merit badge
Small-Boat Sailing merit badge
Snow Sports merit badge
Soil and Water Conservation merit badge
Space Exploration merit badge
Sports merit badge
Stamp Collecting merit badge
Surveying merit badge
Swimming
Textile merit badge
Theater merit badge
Traffic Safety merit badge
Truck Transportation merit badge
Veterinary Medicine merit badge
Water Skiing merit badge
Weather merit badge
Whitewater merit badge
Wilderness Survival merit badge
Wood Carving merit badge
Woodwork merit badge