Hunting Guild Ranks
Like every guild found in Elder Scrolls games, the Hunters of Skyrim guild has ranks. You are recruited at the bottom of the chain, and by following the main story, completing contracts, and achieving great things for the guild itself, you will be promoted. However promotion won't always be your only reward, sometimes you will earn gold or weapons/armour, amongst other things.
Any incomplete requirements are because they're not set up yet.