Reference article
Boat Life (Duck Life 9: The Flock)
Have a stack of 10000 coins in your bag.
Earning it
Have a stack of 10000 coins in your bag. You must hold 10,000 Coins at once; total lifetime earnings do not count.
Trophy collection
The trophy is added to your bag when its requirement is met. Each trophy records its achievement date and is awarded once. Browse your collection in the 
Museum.