You can see below the video of the complete walkthrough with the 8 achievements :


Achievements :
5:00 goal : roll the mirrored sphere up the stairs
7:17 ballast : threw the cube into the pit
8:00 immortal : jump into the pit
11:02 secret room unlocked #1 : find secret key
15:49 first contact : trigger the shadow
17:57 secret room unlocked #2 : find secret key
22:49 initiation : finish the game
22:49 master : finish the game in one try

Have Fun !

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Fredericma45 Gaming