Until recently, I had never bothered about the whole Ambrosia thing. I still haven't revived a ghost with it yet.
In World Adventure, I've left 3 tombs untouched, the Faerie one in France, Abu Simbel in Egypt and the Teracotta Army in China.
In Ambitions, I've played all the professions, but usually not long enough to fulfill their respective LTW. Ghost Hunter is the one I've played the most, how lucky

There are some ghost types I've never had. I usually let my Sims live full life, I'm way too kind with them!