Full list of all 15 ilomilo achievements worth 250 gamerscore. It takes around 8-10 hours to unlock all of the achievements in the base game on Xbox 360.
The base game contains 12 achievements worth 200 Gamerscore, and there is 1 DLC pack containing 3 achievements worth 50 Gamerscore.
Advanced to chapter 2
Completed the tutorial
Collected one safka of each color
Completed a level
Get to chapter 3
Complete the game
Play the solo instrument to the music theme in the main menu
Get to chapter 4
Complete all bonus levels
Defeat a Nabber in the same move as you complete a level
Get a score of 500 points or more in the ilomilo shuffle minigame
Help find all 10 floating eggs with the fly while playing cooperatively
Complete autumn tale (autumn tale)
Complete all bonus levels (autumn tale)
Point on all the 5 floating eggs with the fly while playing cooperatively (autumn tale)