Just as the title says I have NO idea whatsoever what the quests are for. Are they for some point system, or just achievements? I don't know so please answer in comments.
They're just kind of achievements,used for nothing right now through they may be used as some kind of point system in a later update. We used to have Ap points, where you would get points for commenting, posting, and rating games to go up ranks. But those were taken out in January.
Well there is talk of a Quest leader board some time in the future.
So a leader board for how many quests people have? Well that will make Armor Games more interesting, plus it may make more activity in the "Quest" section of the forums.
Kongregate has a point system for each of their game. you complete some quests and earn points, and it makes you progress in level. the higher level you are, the more games you have mastered.