Here is the full list of all 15 Hard Times at Sequoia State Park achievements.
Unlocked Celeste
Unlocked Sara
Complete All Mutual Scenes
Complete All Path Scenes
Play the Story a Third Time
Dreaming of Sara
Complete All Dominant Scenes
Play the Story a Second Time
Dreaming of Celeste
Complete All Passive Scenes
Play the Story for the First Time
Picture with Becky
Deal with the Pest
Dreaming of Becky
unlock Alice