Why is there not a glitch category for 100%?

Also for objectives, how is it determined that all have been done (is it that every objective is determined by the message that appears in chat (ie Objective: .....)?

Or is all Major Quests the glitched category of 100% (just under a different name).

For all Major Quests it says "Most objectives must be completed" what is most? or is the goal of that run to get the thank you for playing in any way possible?