Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
Admiral ( 20 points )	Earn every type of medal.
Big Booty ( 30 points )	Unlock all the secret ships.
Black Heart ( 20 points )	Win 50 Matches in total.
Cabin boy ( 5 points )	Complete the tutorial.
Death From Above ( 15 points )	Kill a non-airborne enemy while flying.
Hoarder ( 10 points )	Win every championship.
Ka-boom! ( 10 points )	Sink two enemies with a TNT.
Master and Commander ( 20 points )	Win 15 gold stars in challenge mode.
Mine all mine! ( 30 points )	Collect over 5000 mines.
Ram ram ram the boats... ( 15 points )	Use the ram power up and kill two opponents in one go with it.
Sailing Pretty ( 10 points )	Win 7 stars in challenge mode.
Salty Sea Dog ( 15 points )	Win 25 games online.