How are you planning on tackling npc death? I wanted to know if you'll include the death system in Morrowind and the back path option. I'm trying to write up an achievement system for skywind and I needed to know if this will be included since I was considering having you beat the game via the back path be an achievement (the achievement would be called Cutter of Threads- Complete the main quest in a doomed world)
I'm aware that having essential npc's be able to die would likely cause conflict with the radient ai system which is why I never play skyrim with the killable essential npc mod.

There is no plan currently to
There is no plan currently to do the "back path" option, if you're talking about joining Dagoth Ur.
Are you simply making a list of achievements or are you planning on implementing it in the CK at a later point? Because if it's just a list, I'd say it is highly unlikely anyone will spend the time to implement it unless you do it. Power to you if you are. I'd look into how it's done in Skyrim via the CK if you are serious about this.