Level up Speech to maximum.
To earn this achievemnt you should work toward it at the beginning of the game by choosing speech as your principal skill. You can then gradually increase your skill by selecting every dialogue option available to you throughout the game. In options of persuasion, always choose those relating to speech rather than intimidation, charisma or bribery.
There are four books that can be acquired which increase speech skill, the names and locations of which are shown below.
|Silence is Golden and Other Myths||Innkeeper of Rattay|
|Silence is Golden and Other Myths 2 (Level 5)||Charlatan of Sasau|
|Silence is Golden and Other Myths 3 (Level 10)||Beggar - Random Encounter|
|Silence is Golden and Other Myths 4 (Level 15)||Treasure 15 (In the woods south west of Neuhof)|