No, during the foreclosure process, only the house used as collateral can be taken by the bank. Since you pledged the property as collateral for the loan, the lender will sue for the forced sale of that home to pay off the loan.
In terms of a deficiency judgment after foreclosure, the bank may be able to go after other assets, but your retirement funds are generally protected. If you have an IRA or 401(k) or 403(b) or similar program, then the bank can not try to seize it. If your retirement funds are invested in a second home or a prize race horse, then the bank may be able to to go after those other assets.
However, banks rarely go after deficiency judgments. They know that people in foreclosure do not have the money to pay the mortgage payment, let alone pay the entire foreclosure judgment or a deficiency judgment after foreclosure. It's just not worth their time to keep suing you without ever collecting anything from it.
The only institutions going after your retirement funds are the banks and government, which are inflating the money supply, manipulating the interest rates, and generally making your retirement funds worth less right now. You can't make them stop that, unfortunately, but you can rest assured that the banks and government can't go after your retirement funds directly, even in the case of foreclosure.