Reach the Dark Water Level without the Death Sonar.

Complete the game without dying more than 3 times.

Find the hidden glyph in Origin Beach ("Never have we heard...").

Complete the game 2 times.

Pass the Undercaves without dying once.

Pass the Undercaves without being hit by an Octopus.

Acquire the Death Sonar.

Kill 30 enemies with the Death Sonar.

Kill 10 Sharks in a row.

Rescue the dolphin family in The Lagoon level.

Reach Ridge Water without dying.

Find the glyph in Island Zone that tells you to find Big Blue.