Here is the full list of all 10 Firewatch achievements. It takes around 4-5 hours to unlock all of the achievements on Windows.
Got stung by a bee. It happens.
Got attacked by a raccoon; probably didn't get rabies.
Filled a disposable camera with photos.
Adopted a turtle as a pet. The average lifespan of a box turtle is fifty years. It will outlive you.
Listened to the tape of "Ol' Shoshone." Cavorted among the aspens.
Completed Day 79
Completed Day 77
Completed Day 76
Completed Day 2
Completed Day 1