Line a 13X9 inch baking dish with tin foil.
In a large saucepan, heat sweetened condensed milk over medium heat for about 5 minutes or until heated through.
Add white chocolate, orange juice, zest, and a pinch of salt stirring until the white chocolate is melted.
Remove from heat and stir in the cranberries and pistachios combining thoroughly.
Spread mixture evenly into the foil-lined pan and allow it to come to room temperature.
Cover and refrigerate for 3 hours.
Remove fudge from the pan by gripping tin foil. Remove tinfoil from the fudge and cut it into pieces. Serving size will depend on how big you cut the pieces.