Here is the full list of all 12 Always The Same Blue Sky... achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Endear yourself to Kira as much as possible
Alienate yourself from Kira as much as possible
Travel to an undiscovered land
Reach ending 1
Demonstrate a firm scientific grasp
Captivated by what could be...
A calming glow
Reach ending 2
Visit the ancient courtyard
Try 2 different milkshakes
Take note of your surroundings
A burning fire