CheatCodes.com has the complete list of all Ecco The Dolphin Achievements and Gamerscores for X360, including all secret Achievements. All official X360 achievements for Ecco The Dolphin as of Friday March 27, 2015 are shown below, or you can print out our Printable Achievements Checklist that shows all Ecco The Dolphin Achievements and Gamerscores in a simple quick-reference format.
Pass the Undercaves without dying once.
Acquire the Death Sonar.
Rescue the dolphin family in The Lagoon level.
Complete the game 2 times.
Reach Ridge Water without dying.
Kill 10 Sharks in a row.
Kill 30 enemies with the Death Sonar.
Pass the Undercaves without being hit by an Octopus.
Find the hidden glyph in Origin Beach ("Never have we heard...").
Complete the game without dying more than 3 times.
Reach the Dark Water Level without the Death Sonar.
Find the glyph in Island Zone that tells you to find Big Blue.