You can see the walkthrough of the full game including all achievements (some are missable) in the following video :
Video contains some hidden achievements / Spoiler


0:00 Chapter 1
2:13 Chapter 2
9:29 Piecing it Together : A story told through photos
16:20 The Beginning : The original purpose hidden in the photos
16:21 Chapter 3
17:52 Jingle Bells : Ring ding ding ~
24:06 Mobius : Everlasting
25:45 Tidying Master : The master of organization.
27:29 The Journey : Follow he footsteps
27:30 Chapter 4
30:34 Keen Eye : Math whiz.
31:51 Behind the Frame : A familiar number
32:42 Foodie Photographer : Eat it while it's hot.
35:31 Setting Sun : A Pleasant afternoon
35:32 Chapter 5
47:24 Sudden Shower : An extinguised campfire
47:28 Chapter 6
49:47 Sealed Memories : Grayed-out memories
51:09 You Pressed 24 Buttons : …And realizes it wasn’t the right answer
52:54 5-Stars Review : Don’t forget to like and subscribe and hit that little notification bell
56:03 Chapter 7
58:44 Chapter 8
59:37 Complete : A rewakened memory
1:03:33 A Nonexistant Day : Like a promise you can’t keep
1:07:36 The Promise : Beyond the stars
1:07:39 Chapter 9
1:10:39 Lost : A change of perspective
1:12:04 Memories of Starry Skies : A picture engraved in your mind
1:14:20 Constellation : My very own starry sky.
1:14:21 Chapter 10
1:16:05 Forgot to Press the Shutter : An unwavering companionship.
1:18:58 A fleeting Moment : Don’t miss your chance
1:19:12 Photography Enthusiast : Time to organize the album
1:29:08 The Pursuit : The other star names EOS


Have fun !


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