Here is the full list of all 30 The Pillar achievements.
Completed the Intro level.
Completed the Misty Hill level.
Reached 70% high score in the Misty Hill level.
Made perfect score in the Misty Hill level.
Completed the Garden level.
Reached 70% high score in the Garden level.
Made perfect score in the Garden level.
Completed the Maze level.
Reached 70% high score in the Maze level.
Made perfect score in the Maze level.
Completed the Gorge level.
Reached 70% high score in the Gorge level.
Made perfect score in the Gorge level.
Completed the Stonehenge level.
Reached 70% high score in the Stonehenge level.
Made perfect score in the Stonehenge level.
Completed the 8 stones level.
Reached 70% high score in the 8 stones level.
Made perfect score in the 8 stones level.
Completed the Planetarium level.
Reached 70% high score in the Planetarium level.
Made perfect score in the Planetarium level.
Collected all the hidden pieces in the Misty Hill level.
Collected all the hidden pieces in the Garden level.
Collected all the hidden pieces in the Maze level.
Collected all the hidden pieces in the Gorge level.
Collected all the hidden pieces in the Stonehenge level.
Collected all the hidden pieces in the 8 stones level.
Collected all the hidden pieces in the Planetarium level.
Completed the game.