Tuscany - Showtime
In this mission you have to get rid of the man that is visiting the theater near the town. The area is guarded very well, but there is a simple way to kill him. Avoid contact with the soldiers and walk from the north side.  Here eliminate two guards located on the higher and on the lower wall. 
At all the time observe the gap between the walls - two guards will come out after your target.  When they will be near the edge, jump down and kill your target  and then escape.
Venice - Thicker Than Water
You have to follow the gondolier - he will lead you to the target. You can do this in many ways.  In the end we will reach the ship - we are waiting for a moment until you opponent will appear. 
Your target is a man on the boat - get close to him.  Now you can just drag him into the water. 
Venice - Zero Tolerance
A man is chasing a woman in that location. You have to grab him so that a woman will not realize it - you can do it from the well  or hay. 
Venice - Blade in the Crowd
In this mission you must to act very quickly - you have to kill 3 people that are walking in the streets in marked areas. They cannot see you, however, it is good to sneak from behind.  First target can be found on a walk near the canal. 
The second one walks near the bridges - you can hide among other people and for example, use a gun.  The third is on the street nearby - act quickly, you can even kill him eye to eye. 
Venice - Honorable Thief
First, go for a meeting with a thief.  Now, follow him from a bridge to the roofs of. 
At the top you will have to fight with archers - the easiest way is to throw them from the roof to the ground.  Finally you will find yourself on the roof with your target - eliminate him. 
Venice - No Laughing Matter
This time, you have to kill 3 clowns. First one is in the north on a square near the well - you can sneak up to him and eliminate.  Another target is guarded by a large army  but fortunately, when you will approach he will mindlessly run away, so kill him.
The third objective can be reached without any problems: from the water  - just grab the edge and assassinate him. 
Venice - Crash a Party
Run to the marked area and target your enemy.  Now, follow one of the wedding guests. This person will come to the gate secured by some guards  - here climb onto the roof and watch the situation.
The person that have to be killed is hidden between the columns.  You can jump from the roof into the water and swim to the shore. Now go out and hide in a group of people. Then kill your target. 
Venice - False Legacy
You have to finish the target that is surrounded by soldiers. The easiest way to hire nearby mercenaries and command them to attack guards.  When the battle will begin enter the fight and kill the proper man.  Then discreetly go away.
Venice - Hunting the Hunter
You are looking for a killer that wants to kill you. You can get some clues from the first target pointed by Lorenzo - find the square and target the messenger.  Kill him and search his body. 
Go to the second target that is under the roof near the hay  Now you will see that it was a trap - hunters will jump from the roof. Eliminate them.