You passed the Undercaves without dying once.

You acquired the Death Sonar.

You rescued the dolphin family in The Lagoon level.

You completed the game twice.

You reached Ridge Water without dying.

You killed 10 Sharks in a row.

You killed 30 enemies with the Death Sonar.

You passed the Undercaves without being hit by any Octopus.

You found the hidden glyph in Origin Beach.

You have completed the game without dying more than 3 times.

You reached the Dark Water Level without acquiring the Death Sonar.

You found the 'Find Big Blue' glyph in Island Zone.