https://forums.elderscrollsonline.com/en/discussion/377018/precursor-maker-achievement-guide





The reward is literally the Precursor as a furnishing target dummy. He has ~300k health and makes a comment whenever you hit him, as well as when he is killed and respawns. As far as I am aware it is possible to obtain the Precursor dummy several times, if you were to do the achievement on multiple characters, so to those players wanting to assemble a robot army, your time is nigh!