Full list of all 20 ilomilo plus (Windows) achievements worth 200 gamerscore. It takes around 15-20 hours to unlock all of the achievements on Windows.
Helped find all 10 floating eggs with the fly while playing cooperatively
Completed all bonus levels
Completed the game
Experienced all memories
Collected all yellow safkas
Advanced to chapter 4
Played ilomilo shuffle
Defeated a Nabber in the same move as you completed a level
Advanced to chapter 3
Completed the level "playroom" in Playroom Escapade in less than 200 steps
Walked 70 steps in a row with the same mimic attached
Fully loaded piccolo
Turned one cube into three, using only two mirror cubes
Advanced to chapter 2
Unlocked Playroom Escapade
Ate all the apples on Apple Mayhem
Improved the score on a level
Collected one safka of each color
Completed the tutorial
Completed a level