Baptism, Confession, Eucharist, Confirmation, Marriage, Holy Orders, Extreme Unction.
A layman, even a non-Christian can perform Baptism as an emergency when the baptised is about to die. The valid trinitarian formula must be used, as well as, of course, water, and the celebrant must intend that to be Christian baptism. I am not aware of other exceptions.
Thank you. These are even more restricted to the "priesthood" than I suspected making them all the more special. As a side note, doesn't the performance of each sacrament by the standard non-Priest RC get grace for him?