Are there already acquired resistances to certain alcohol-based hand disinfectant?

No.
Background:
Due to the non-specific effect of disinfectants on bacteria, resistances are not expected to develop. The alcohol molecules damage the outer cell membrane. They penetrate the cell plasma and destroy the inner structure of cell molecules and proteins of the cell plasma. This process, called denaturation, and the coagulation of enzymes lead to a loss of cellular activity and finally to cell death.

Only the inappropriate use of disinfectants can lead to the development of resistances, e.g. if the concentration of the active substance and exposure time are too low.