A few things to go over
First) when viewing the master quest list I would appreciate it if the quests that the user has done were more obviously marked when completed. That way when your looking down the list at what you haven't finished to find a quest to do that you can quickly note whats next. Just a simple "complete" or star icon on the bottom of the shield would be grand.
Second) I know I'm not the only one, but I'm an OCD completionist. There is few quests that will drive me up a wall and as long as they are not glitched and prevent me from getting them. I will continue to try and get them.
Finally) and this relates to the previous section. The "achievements" from the old site that no one can possibly get ever. These will be a thorn in my side. forever mocking me that I can't get them. Remove them from the "achievements" area as if they were something that you could get.
I've been playing on armor games for ages and finally made an account when online saves were added as a feature. I don't know if i qualify for any of those old site things, but i don't really care as long as they aren't called an "achievement".