The lost city and shilo and itch ARE possible on pures, the only one on this list that would be very hard would be the feud ? cause the 2 mobs ( menaphite thugs) can hit very hard on you and they have like 80 hp ea and are fought in a row. , i actualyl wanna see a screen of someone beating em?
The list is definitely not perfect, by any means, and I wouldn't recommend just going by the list, but it's still a nice way to know approximately which quest are possible