If I want one state to be able to transition to the 20 other states in my animator, is there a way of doing that that doesn’t involve creating 20 different transitions? Can one state represent all the other states and I can just make a transition to that state?
Not really. Blend trees? Manual Invokation? Layering? Legacy Animation? Creating your own state machine??
Saying that, the Animator is pretty fully featured and well exposed. Perhaps you can simply anim.play("State"); a state.