The achievements are linked to the endings. If you check "Unseen text" in the settings, you can hold down the CTRL key to skip past dialogue. Then you can click every optional path
Follow up, I went through every combination that I can think of but I am not unlocking the Ending 1 and Ending 9 achievements, any specific dialogue paths I need to take for these 2 endings? I have every other ending's achievements.
