I don't even think it'd be that hard to make something that can at least be all terrain.
Not a Gundam, probably something more like the amp suits from avatar (not the Nickelodeon show I'm not insane)
We have Boston dynamics robots, literally just scale up one of those, give it a cockpit, and have it figure out what it's supposed to do movement wise based on the pilot's input.
Legs are controlled by the mech but commanded by the pilot, meanwhile the hands are fully controlled by the pilot.
This is braindead easy.