Firstly my idiom means
that I'm not ask for Imporssible
I'm not crying for the moon all what I want is a car
انا لااطلب المستحيل
And Your idiom is
Entirely undamaged or unharmed, as in Given all the airport delays and bad weather, we were glad to arrive all in one piece , or She was relieved when he returned from Nepal in one piec