You can see the complete walkthrough of the game including all achievements in the following video :


Levels and achievements :
0:00 Level 1 : Crucible
0:28 Journal 1/7
0:42 Journal 2/7
1:55 Achievement Deep Sleep : Attempt to break the boundaries 10 times
6:50 Level 2 : Absalom I
8:17 Level 3 : Twelve
8:50 Journal 3/7
9:28 Journal 4/7
9:50 Journal 5/7
10:17 Achievement Seafarer : Take a nice, long swim in the sea
19:34 Level 4 Sarcophagus
23:39 Level 5 : Absalom II
24:24 Level 6 : Dragon
25:21 Journal 6/7
27:51 Level 7 : Mountain
28:27 Journal 7/7 Achievement Expresionist : Find and read all journal entries
Achievement : Enjoy the view : Spend at least one hour exploring a dream.

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https://www.youtube.com/channel/UC6XBtiqWdATVjR9ywYPPvxg/join

Have fun !