Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock	Points
Ahoy!	Find a shipwreck	20
Alternative Fuel	Power a furnace with a kelp block	20
Atlantis?	Find an underwater ruin	20
Castaway	Eat nothing but dried kelp for three in-game days	20
I'm a marine biologist	Collect a fish in a bucket	20
Me Gold!	Dig up a buried treasure	30
Sail the seven seas	Visit all ocean biomes	40
Sleep with the fishes	Spend a day underwater.	30