Full list of all 11 Immortal Planet achievements worth 1,000 gamerscore. It takes around 15-20 hours to unlock all of the achievements on Xbox One.
Level up at least once
Die first time
Complete first room without taking any damage
Defeat Alien Commander for good
Reach the forbidden Temple
Defeat Prisoner One for good
Defeat Alpha Twin
Defeat Temple Sentinel for good
Finish the game
Complete the ultimate challenge
Finish the game in New Game Plus