There is only one: the Wheel, because Road is always needed right from the start.
Every other starting tech's necessarity depends on the situation:
- Fishing would be a priority if and only if our Capital is coastal (no matter if there is Fish/Cram/Crab near it or not)
- Agriculture would be a priority if and only if our Capital is near a resource that requires Farm or Pasture (which is very likely, but not garanteed)
- Hunting would be a priority if our Capital is near a resource that requires Camp or if building Scout/Spearman/Archer is important for us (which is mostly not a scientific, but a rather military decision)
- Mysticism would be a priority if and only if we are spiritual (in which case we would be already coming with it, and Meditation/Polytheism would be the actual priorities)
- Mining would be a priority if our Capital is near a resource that requires Mine or Quarry, or if we adopt an opening-stage chop-rush policy for our Workers (it's my personal style, but it's generally disputed and therefore subject to furhter discussion).