Here is the full list of all 13 Etherborn achievements. It takes around 3-4 hours to unlock all of the achievements on Windows.
Complete level Structured Thoughts
Complete level Desert of the Mind
Complete level Shapes of a Memory
Complete level Birth
Complete level The Longing of the Stones
Reach the end of the game
Complete level Birth +
Complete level Shapes of a Memory +
Complete level Desert of the Mind +
Complete level Structured Thoughts +
Complete level The Longing of the Stones +
Reach the end of the game on 'Game +' mode
Reach the end of the game on both normal and 'Game +' modes