Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
Big Blue Message ( 50 points )	Find the glyph in Island Zone that tells you to find Big Blue.
Death Sonar ( 10 points )	Acquire the Death Sonar.
Ecco the Hero ( 10 points )	Rescue the dolphin family in The Lagoon level.
Game Win 2x ( 10 points )	Complete the game 2 times.
Game Win 3 ( 20 points )	Complete the game without dying more than 3 times.
Life Saver ( 10 points )	Reach Ridge Water without dying.
Octopus Avoider ( 15 points )	Pass the Undercaves without being hit by an Octopus.
Shark Killer ( 10 points )	Kill 10 Sharks in a row.
Sonar Free ( 35 points )	Reach the Dark Water Level without the Death Sonar.
Sonar User ( 10 points )	Kill 30 enemies with the Death Sonar.
Songs in the Sea ( 15 points )	Find the hidden glyph in Origin Beach.
Undercaves Survival ( 5 points )	Pass the Undercaves without dying once.