About your side note, did you see that lecture online? Will be cool if I can have a look at it; I have a BS in CS so I think won't be much of a problem ;)
Let me link the youtube channel instead, since it's a lengthy college course (if you wanna see all the videos):
About this, you mean like a place in the game where the progress of achievements appear?
Yes, the frame or window showing you the list of achievement obtainable or obtained. An achievement pane is essentially the same as a game screen, except that the entities/files used are 2D images and text rather than mobs, loot and buildings.