First of all you need to find a way in to the museum. There's a passport on a bench to the left. Follow Bourne Instinct. Go up the pipe. When you're already inside try to silently eliminate the guard. Go downstairs and get rid of two another guards. Pick the lock to security room which is on your left and collect a passport. Upstairs you will notice a dead body. Keep going, open the door and you'll witness a murder. Then you'll get attacked.
After the fight go to the door on the right and pursue the murderer. There's a passport in a big room near a statue. Fight off some thugs and climb up the scaffolding. Another passport is next to some paint cans. Use the pipe to get to the other side of the room. Turn left and open the door. When you're in, go left. You'll find a passport at the end. Assassin will attack you. After the fight get through the door. Listen to the conversation and follow Renard. Eliminate the guard silently and get into a shaft. When you get outside listen to another conversation. There's a passport in a white-orange spot. Your objective now is to find a bomb.
When you succeed with it watch the cut-scene. You have to get a gun as quick as possible and shoot all terrorists. Collect the ammo and run upstairs. On the left you'll find a passport. Go through the room and then downstairs. You have to force through the next rooms. In the alcove under the stairs there's another passport. Go upstairs and then through the door on the right. You'll have to deal with two opponents there and one "mini-boss". Afterwards get through another door and shoot at anything that moves.
When you get upstairs, you'll see a passport on your left. When every level is "cleared", head towards the big door. Another count-down will start and a sniper will try to take you down. You know what to do. Go straight until you get stunned by a flash-bang. After the fight you need to kill to more snipers and then go straight. The last passport is near a tree by the waterfall. After that just watch the cut-scene.