cookie_ids = Cookie.objects.filter(board__pk=self.kwargs['pk']).values_list('id',
                                                           flat=True)

sugar_ids = Sugar.objects.filter(board__pk=self.kwargs['pk']).values_list('id',
                                                           flat=True)

**then:
context['cookie_actions'] = Action.objects.filter(target_id__in=cookie_ids)
context['sugar_actions'] = Action.objects.filter(target_id__in=sugar_ids)