Conversion of ATP to NADH without creating a proton motive force?
I am not aware of any enzymes that both oxidize NADH and generate ATP.

However, in the absence of oxygen, many bacteria ferment ethanol and acetate (among other products) to oxidize NADH and produce ATP. ATP is produced by acetate kinase and NADH is consumed by dehydrogenases in the parallel ethanol secretion pathway. Together, these pathways consume (or more accurately, recycle) NADH and generate ATP.



http://mmbr.asm.org/content/69/1/124/F6.expansion.html