Assassin's Creed II Guide - Walkthrough
Meet Lucy in the complex downstairs to test your skills. You just have to hit the four sensors to complete the training. Two of the sensors are on the ground floor, and the other two are on the catwalks above. Run to either side of the warehouse, press the buttons there, and then climb the stack of boxes to reach the catwalk. Activate the sensors on both catwalks and then return to Lucy.
Exit the complex to trigger a memory sequence. Sprint forward to spot a woman; start after her when she takes off. Just keep up with her as she moves through the city. Activate Eagle Vision if you lose track of her. When she enters the tower, jump onto the railing and grab hold of the ridge along the base of the tower. Climb up to the balcony railing and then jump up and grab hold of the wooden post. Continue climbing up to the top of the tower and hit the marker there to trigger a cutscene.
Back in Acre?
After the cutscene, approach the Animus and press any button when you're ready to continue.