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