I do not agree. Microeconomics has also branches. The usual divisions of micro are general equilibrium theory, game theory, decision theory and information economics. See the following link from a well known professor: levine.sscnet.ucla.edu
What Are The Types Of Microeconomics?
If you have an assignment for the branches of economics then I will give you the link from where you can the details o all of the branches of economics. However, Microeconomics is among the few branches of economics and it does not have any further branch. It deals with the study of the behavior of the people and business and many other things.
Branches of economics
Branches of economics