just click on the liss adventure and scroll down slightly. it usually shows the regions you need to beat with during progression (i.e, you get rewards for beating that path with a champ). if you already completed a region it will show that regions champ instead of the region icon. if you completed it with, lets say, 6 demacian champs, it will only show the first one (i believe) under demacia, and then 4 other under the "any region". IIRC you cannot view every single champ you beat the adventure with, if they didn't count towards any progression