The information that you have given is inadequate. To design the KRAs, one needs to understand the systems and processes of the entire department. Based on the systems and processes, we have to assign the KRAs to the various persons working in the department.
As far as recruitment activity is concerned, it can be said that the position has to be filled, within the specified turnaround time. This is the primary KRA. To bring the clarity, you need to prepare the turnaround time chart for the filling the various positions.
For the trainer nothing can be said as such because we do not know what kind of training that person conducts. The most important KRA for this position is ROI on the Training Programmes. But before assigning this KRA, it is important to know whether this KRA can be applied or not.
Designing KRAs for Admin position is as such difficult. Most of the admin positions have less measurable activities.