do i have to do 2 demo levels the first encounter,second encounter and legend of the beast or do i just do second encounter?

As such, there is no such thing as “All Stages” for all parts of Sam except First Encounter in Classic, HD, and Fusion variations. On this site there is no possibility to add separately from other games “All Stages” only for First Encounter games, so this category is for all games, but pouring your runs of games other than First Encounter into “All Stages” is strictly forbidden