I heard Actuaries are in high demand. What is the chances for a MFE to transition to this field? I guess there is certificate to pass like CFA or CPA?

I'm guessing you are based in the US as you referenced CPA... I am more familiar with the UK, but some of this will be similar in the US.In the UK the relevant bodies are the Faculty and Institute of Actuaries and in the US the Casualty Actuarial Society and the Society of Actuaries.In the UK the exams typically take at least 3 years (often quite a lot more), the biggest issue is that the exams don't have a fixed pass mark so you have to perform better than a sizable proportion of the other students. In the UK you might be able to get some exemptions based on your MFE and relevant undergrad studies, I don't know how things work in the US. You need (about 3 years) experience in addition to the exams to qualify.I'm sure an MFE would help your application for entry level roles, whether you'd be able to use it to gain a better starting role would depend on the job specifics.

The maths are completely different but equally doable, both very straightforward and almost purely computational. SOA is the certification you'r talking about. The first 3 are like probability, bond math, insurance, and the last couple require work experience. The transition should be very easy and actuaries do get very competitive salaries.