Accomplish the indicated achievement to get the corresponding number of Gamerscore points:

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