Here is the full list of all 10 Before I Forget achievements.
Reach the end of the game.
Find all the photos of Sunita and Dylan.
Find all the pages of the sheet music.
Read all the letters, cards and emails.
Reach the end of the Teacup stargazing scene.
Reach the end of the 1970s Flashback scene.
Find the tinned peaches.
Find all the musical interludes.
Reach the end of the Telescope stargazing scene.
Reach the end of the Starmap stargazing scene.