get_actions.py

import bpy

arm = bpy.data.objects["Armature"]
bones = set(b.name for b in arm.data.bones if b.use_deform)
for action in bpy.data.actions:
    supported = not bool(set(g.name for g in action.groups).difference(bones))
    print("arm '%s' can be animated by action '%s' %s" % (arm.name, action.name, supported))