Actuarial science is a career path that does not require grad school. While some colleges offer a major called “actuarial science,” many do not.
However, there is a series of professional exams (4) that must be passed before one can become an actuary, and it would be difficult to pass them without taking the requisite math (calc 1, 2, 3, linear algebra, differential equations), statistics (regression analysis, time series, etc), economics, and finance courses. It is recommended that 300 hours be devoted to studying for each preliminary exam (the P, MFE, MLC and FM exams) and, even then, the exams have a 40% pass rate.
In addition to the four preliminary exams, one must attain a B- or better in a series of college finance, economics and statistics classes to become an actuary (the “VEE” requirements).
Once you pass the four exams and complete the VEE requirements…to climb the ladder in the career you should continue to take as many additional exams as you can pass. The more you pass, the higher your earning power. The pass rates for these continuing exams gets lower and lower. So, while there is no grad school, there is an enormous amount of self study and discipline required to advance in this career.
I believe NYU has an actuary club. If you are interested, look into it.