Full list of all 10 Before I Forget achievements worth 1,000 gamerscore. It takes around 0.5-1 hour to unlock all of the achievements on Xbox One.
Reached the end of the game
Found all the photos of Sunita and Dylan
Found all the pages of the sheet music
Reached the end of the Teacup stargazing scene
Reached the end of the 1970s Flashback scene
Read all the letters, cards and emails
Found all the musical interludes
Reached the end of the Telescope stargazing scene
Found the tinned peaches
Reached the end of the Starmap stargazing scene