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