In order to begin the mission, head to the house marked on the map and try to enter it.
After the owner shuts the door before you, go sleep in the barn ad try again tomorrow.
Firstly knock on the front door. Without any reaction from the owner, try the back door.
After another failed attempt, try getting in through the balcony. After the conversation ends, head back to the barn.
Optional objective: Limit health loss - 50%.
In the middle of the night you will be attacked by a group of bandits. Defeat them with fast counterattacks and combos while making sure not to lose more than 50% of your life. That way you will gain a full synchronization.
After the fight you can head inside the manor and speak with Achilles. The man will take you to a hideout where the mission will end.