When you complete an Activity you are awarded with various permanent advantages in the game. Also you should activate the Hitman activities asap, as explained below. So instead of being shot at and harassed by other gangs when you're trying to do an Activity, your homies will actually help you out on the street. This will not only give you more experience but more importantly it turns all of the neighbourhoods on the map friendly. It is advisable to complete a good amount of the main campaign missions as possible before starting the Activities. If you're alone and still wish to make a start concentrate on the collectibles, the main campaign, unlocking shortcuts etc and getting a good feel for the gameplay until your Co-op buddy is with you. DO NOT even go near any of the main 12 Activities without your Co-op partner. To ensure this achievement doesn't glitch you must start a brand new campaign, on easy if you like, and complete the first few tutorial missions. Some important points before we systematically complete these activities:
You must only activate them when you are connected and ready with your co-op partner. It is essential to start a new game and not to touch any of the main 12 Activities in single player. IMPORTANT: The achievement for completing all Activities in co-op 'Confidence Men', cannot be unlocked if you have completed any level of any Activity alone.
