Here is the full list of all 55 Light Apprentice achievements.
You completed Chapter 1 on Easy!
You completed Chapter 1 on Normal!
You completed Chapter 1 on Hard!
You completed Chapter 2 on Easy!
You completed Chapter 2 on Normal!
You completed Chapter 2 on Hard!
You completed Chapter 3 on Easy!
You completed Chapter 3 on Normal!
You completed Chapter 3 on Hard!
You completed Chapter 4 on Easy!
You completed Chapter 4 on Normal!
You completed Chapter 4 on Hard!
You have unlocked the hidden power of the Pacifist!
You have unlocked the hidden power of the Warrior!
You chose to attack the slime!
You chose to avoid the slime!
You chose to protect Tlob!
You chose to attack the blob man!
You chose to Negotiate!
You chose to whack'em!
You sided with the Mayor!
You sided with the orcs!
Yuu saved the river!
You didn't save the river...
You nuked the bugs!
You communicated with the bugs!
Nate can't speak Toadish!
Tlob is fluent in Toadish!
You chose to dance with Mya to earn a few coins!
You chose to hammer your misery away!
You completed Chapter 1 Quests on Easy!
You completed Chapter 1 Quests on Normal!
You completed Chapter 1 Quests on Hard!
You completed Chapter 2 Quests on Easy!
You completed Chapter 2 Quests on Normal!
You completed Chapter 2 Quests on Hard!
You completed Chapter 3 Quests on Easy!
You completed Chapter 3 Quests on Normal!
You completed Chapter 3 Quests on Hard!
You completed Chapter 4 Quests on Easy!
You completed Chapter 4 Quests on Normal!
You completed Chapter 4 Quests on Hard!
You got the Light Sword!
You got the Light Shield!