Besides counting interactions, the Custom Counter interactivity can also be set to register other counters. In other words, it can act as a Counter of counters.
On the Counts option of the General submenu of the Properties panel, you can choose the option Counters. By making this selection on the Interactivities submenu, you will only be able to add Custom Counter-type interactivities. Add all counters you would like this counter of counters to control. In such case, it will not be possible to set limits since only those counters having reached success will be recorded as achieved. You will have to establish though a value on the Success parameter of the Action submenu to set the counter of counters scale of success. If the user's success is reaching success in all counters, then configure the value as the same than the number of counters included. If your consideration is that achieving two successes out of three is already worth to get an award, then set the success value at two.
These parameters can help you establishing a higher or lower difficulty level, depending on what you are after.