So, I know this has been brought up before, but Im bringing it up again. The Kraken needs loot. After you get the achievement there is no incentive to stay and fight the thing. It needs loot! A Kraken eyeball that sells for 3-5k would fit the bill.

Also, to keep people fighting the Kraken, the title "Kraken Slayer" for killing the Kraken ten times would be awesome. Maybe even a purchasable cosmetic rifle with a Kraken eyeball at the end of the scope and one of the tentacle mouths as the barrell once you unlock the title?