Solasta: Crown of the Magister

To unlock this achievement chose the Acolyte background during character creation. Half way through the game you will be able to pick up the Apostasy quest. Complete this short side quest.

Acolyte is a fine background, with Proficiency in Religion, Nature, and Insight, herbalism, and a bonus language. Good for a Cleric, Wizard, or Druid. Note that the game has two quests called "Apostasy." This one is really simple. This quest is available after completing "Gem Quest: The Monastery." Talk to Dalon Lark, the Temple of Einar vendor at the big circle in the city. He'll send you to Rogar Ardentfire, vendor for Arun. He sends you to the Tirmarian Ruins to fight some undead. Return to Rogar.