That is also what I had to do to get it. It appears only changing them from the super powers menu counts, and you must change all 3 of them in one go.The only way I got it to trigger was to set all of them to default, leave the menu, then return to the menu and manually set each power to a different element. When I left the menu that time the achievement triggered.
You made sure they were all set to default first? Left the menu, came back, then changed? It is REALLY finickey about it. You seriously have to do every step I described or it doesn't seem to want to trigger.Tried way as Yukichigai and Joey suggested - didnt worked....