Not one

Today, we learn that the Guantanamo prison closure is unfunded and to be delayed.

http://www.miamiherald.com/news/politics/AP/story/1055641.html

And, the "complete withdrawal" from Iraq has become a "draw down", with a significant number of troops remaining long term (and the withdrawn troops being transferred to Afghanistan).

I honestly cannot think of one foreign policy promise that's been kept.