The promotion to Bandit requires you to perform one assignment, The Elven Maiden, for Armand. Before Armand will give you the quest, you must have sold one hundred gold worth of stolen goods. Go to the chapel in Cheydinhal and steal the bust of an elven maiden from the Undercroft there. Be aware of the guard patrolling the area – she will attack you on sight and you’re not allowed to kill her. Steal the bust and return to the Imperial City. You’ll discover that a traitor has accused Armand of stealing the bust and the Imperial Watch is covering the Waterfront and Armand is in hiding.
Find Methredhel and she will explain the situation to you. You’ll need to sneak into the house of Myvryna Arano, the traitor, and plant the bust in the cabinet to the right of the room. Once that’s been accomplished, tell Hieronymus Lex that Arano has the statue. Lex must have a disposition that’s greater than seventy before he will believe you. At that point, he will question and arrest Arano and you will be able to talk to Armand at midnight. When you do, he will promote you Footpad and the achievement will unlock as soon as the conversation is over.