Here is the full list of all 17 Stones of Yalmrith achievements.
Answer the first Trial of Yalmrith
Answer the trial of the tree of Yalmrith
Answer the trial of the Cube in the Mark Chapter
Defeat the Elder of Words
Solve the Oil Machine Trial
Solve the Mechanic Painting Trial
Solve the light fountain trial
Solve the last trial in the Ruins Chapter
Defeat the Elder of Strength
Solve the first trial in the flames chapter
Defeat the Elder of the Flames
Solve the Rotary trial in the Flames Chapter
Solve the Eyes of Yalmrith Trial
Solve the last trial in the Scholars Chapter
Defeat the Elder of Knowledge
Solve the last trial
Defeat Yalmrith