Maybe they should use a tree structure in <img src="/ubbthreads/images/graemlins/div.gif" alt="" />²
like:
+quests:
-act 1
-act 2
-act 3
-act 4
+trophies
-act 1
-act 2
-act 3
-act 4
Personally I didn't like that all subquest of an act needed to be solved while in that act. Since you can't go back to the previous acts and solve unsolved quests