Here is the full list of all 15 Grisaia Phantom Trigger Vol.3 achievements.
Boot up the game!
Complete chapter 1!
Complete chapter 2!
Complete chapter 3!
Complete chapter 4!
Complete chapter 5!
Complete chapter 6!
Complete chapter 7!
Complete chapter 8!
Complete chapter 9!
Complete chapter 10!
Complete chapter 11!
Play the game in English
Play the game in Japanese
Play the game in Simplified Chinese