You will need launch your system preferences and then click on keyboard then click keyboard shortcuts then click the Application Shortcuts, click the plus sign to add a new shortcut.
Take a look at this link, http://support.apple.com/kb/ph3957
To define keyboard shortcuts use the keyboard Preferences > Shortcuts panel in the Preferences.
- Create an Automatotor service, to open the folder you want,
- Install that service in your User Library "Services" folder (for example named "OpenPicturesFolder)
- Then bind that service to the keycombination you want.
A simple service to open the "Pictures" folder could look like this:
First, an action "Get Specified Finder Items" to select the "Pictures" folder,
Then "Open Finder Items" to open that folder.
You do not need to create a service, if there are already menu commands that do what yu want. Then simply bind the menu command to the key combination.