When your attorney prepares bankruptcy petition, he will have to divide your debts into three different categories: secured debts, unsecured debts, and unsecured priority debts.
Unsecured priority debts are generally non-dischargeable and will not be eliminated by bankruptcy.
Examples of unsecured priority debts for consumers are domestic support obligations (e.g. child support, alimony), taxes, loans from 401(k) plans, and claims for death or personal injury while the debtor was intoxicated.
If you have any questions about which debts will be discharged or eliminated, and which will not, you should consider talking to an attorney.