From the Main Menu, select Stadium Edit. Select any of the unlocked stadiums (All but 2 stadiums will be locked). Once in the Stadium Edit mode, select Make Changes. Using the , highlight any of the features in the stadium and press to bring up the object menu. Select any of the unlocked objects (i.e. Ultra Soft Wall), press to place the object, then press to bring up the menu and select OK. Once you select OK, the Achievement unlocks.
Once you have customized a Stadium, select Exhibition and play and win a game in your customized Stadium to unlock "Home sweet home."