Here is the full list of all 26 Cloud Chamber achievements.
Open the node How The Mighty in Chapter 10
Open the node Ghost Circle in Chapter 9
Open the node Run! in Chapter 8
Open the node Message In A Bottle Music in Chapter 7
Open the node The Family Secret in Chapter 6
Open the node It's A Big Universe in Chapter 5
Open the node Revelation in Chapter 10
Open the node On The Edge in Chapter 8
Open the node Perspective in Chapter 8
Open the node Visionary Music in Chapter 7
Open the node Auditive Algebra in Chapter 6
Open the node Sound Of The Sun in Chapter 4
Open the node In Friedrichshafen in Chapter 3
Open the node 100 Bilion Stars in Chapter 2
Earn 10 "Best post" badges
Earn 10 "Best comment" badges
Open the node Brilliant Minds in Chapter 5
Open the node Preparations in Chapter 1
Like 50 posts or comments
Open the node A New Plan in Chapter 4
Earn a "Best comment" badge
Open the node Did You Kill Your Wife? in Chapter 3
Earn a "Best post" badge
Open the node Ingrid Petersen in Chapter 2
Like a post or comment
Open the node You Are About To Enter in Chapter 1