Here is the full list of all 22 Ladra achievements.
Steal from three chief guards
Get all treasure in one chapter
Find one book hidden throughout the game
Have one converstation in the Valoruke
Unlock your first chest
Quick like lightning. Finish the game in under 1 hour.
Complete one chapter undetected
Complete all chapters undetected
Get all treasure in all chapters
Unlock all chests in the game
Have all the available conversations with one character in the Valoruke
Have all the available conversations with all characters in the Valoruke
Find all books hidden throughout the game
Find all the peculiar guards
Steal from seven chief guards