Here is the full list of all 10 Cubot - there are The Complexity of Simplicity achievements worth 1,000 gamerscore.
The 8 levels of "The Beginning" episode were completed
The 8 levels of "Red Cube" episode were completed
The 8 levels of "Button & Block" episode were completed
The 8 levels of "Green Cube" episode were completed
The 8 levels of "Color Swap" episode were completed
The 8 levels of "Purple Cube" episode were completed
The 8 levels of "Teleporter" episode were completed
The 8 levels of "The First End" episode were completed
The 8 levels of "Orange Cube" episode were completed
The 8 levels of "Autoblocker" episode were completed