I baulked when I looked at that list. I couldn’t do all that in 18 months, it would take literally years. Realistically I think you’d want three or four people if you wanted it done in less than 12 months. Your core gameplay will take time, but you also need it to be network-ready, have AI opponents, and an ingame map editor (said map editor in itself could be a huge amount of work).
@AIR-Z - I think you should consider cutting down what you want to achieve massively and look at what is required for a minimum viable product, then talk to publishers about what more you intend to do and getting the budget for it.