Errr, Eistein fully accepted (as did most others fairly quickly) that quantum mechanics was real -- in fact the duality of wave + particle for photons was something he developed (as part of his developing the theory that explained the photoelectric effect).
The "does not play dice" was mostly with regard to Heisenberg, in which he was determined to find a way to avoid the predicted lack of predictability of the future.
The "does not play dice" was mostly with regard to Heisenberg, in which he was determined to find a way to avoid the predicted lack of predictability of the future.