Ideally a hammer drill or similar it the best tool. However if you have patience you can use a diamond core drill bit. Be sure it is rated for dry use (as opposed to water cooled, by hose or similar)

Something like this.

I would also consider getting a piece of plywood 3/4 or similar. Mount the TV on the plywood and use the cement plugs to hold the plywood. You can then put a number of plugs to hold the plywood.