Press the + button during a mission. Then press Up, down, Up, Down on the Wiimote. After that enter one of the following codes:
|Right, Left, Right, Down, Up, Right
Campaign Medal: Complete all levels in Campaign mode.
Bronze Stars: Complete a mission without dying. Note: A Sprint Recovery bonus is acquired with each Bronze Star earned.
Silver Stars: Complete Campaign mode without dying. A Health Recovery bonus is acquired with each Silver Star earned.
Oak Leaves: Earn any seven medals in Campaign mode. A Health Bonus is acquired with each Oak Leaf earned.
Wings: Land in designated drop zones.
Weapon Expert: Use each available weapons during a mission.
Marksman Award: Shoot a specific number of people in the head during a mission.
World War II: Earn all of the medals in Campaign mode.
Victory Medal: Unknown.