This problem was posted before also. But I'd like to. I've it in my own words. There is a quest where you play 25 games to unlock a starting hero, I haven't got the choice for both plants and zombies. Please reply. My email is [edit: email address removed] and my PvZ hero username is NerdPebble.
I faced the same issue with both plants and zombies. Both times when I completed the final hero achievement, it did not take me to the hero selection screen