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.
Complete the tutorial
Get to chapter 3
Complete the game
Play the solo instrument to the music theme in the main menu
Collect one safka of each color
Get to chapter 2
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
Complete a level
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)