Leader board winner gets:
Other Tier Rewards: (yes, I hate box events and am only doing this one for the guild)
Guild Quest Reward:
GQ 1/10 has collect 20 items
Reward: Seawater Dragon - 125/145
GQ 2/10 collect 45 items
Reward: Stone Gazer Gorgon - 218/207
GQ 3/10 collect 80 items
Reward: Salty Dog Henchman - 325/325
GQ 4/10 collect 130 items
Reward: Tormented Water Spirit - 569/431
GQ 5/10 collect 200 items
Reward: Clawed Terror - 678/822
GQ 6/10 collect 300 items
Reward: Corsair Gunner - 1080/1120
GQ 7/10 collect 430 items
Reward: Tidal Manipulator - 1833/1667
Based on a pattern in current known figures this is the assumption for the requirements from quest 8 onwards:
8 580
9 780
10 1025
These will all need to be confirmed in game.
Will update this post as more info becomes available. All credit for this information is due to viewers like you. Any mistakes are mine.