Objective 2: Get to the top of the Brandenburg Gate
After getting rid of all of them, leave the building and head to the opposite one [#3], which will lead you to the Brandenburg Gate square - after jumping through a hole on one of the floors. This time your main worry should be the tank - the below description will let you pass this part without getting noticed. As for the collectibles, leave them until you clear the whole area. Begin with the soldier who's walking on the left.
Crawl to the first wall [#4] and wait for the enemy patrolling the middle of the square to get near. In the distance you should note a soldier walking on the other side of the square.
Wine Bottle! 2/3 - On a rather big pillar.
Wine Bottle! 3/3 - On the Brandenburg Gate.
Crawl further to the right - try not to get too far onto the small debris pile by the tank, as you will get noticed. Eliminate the walking soldier and continue going onwards (try to stay on as flat surface as possible).
You should reach the other side of the wall [#5]. From this position, you will be able to take out the four soldiers patrolling this side of the square. Eliminate them one at a time, remembering that the ones left alive can notice corpses and begin to search for you - however the explosions should happen in such intervals that will be able to kill them without much problems.
After clearing the square, you will be able to destroy the tank without having to worry about starting an alarm. You will be also able to search the square for Gold Bars - look out, as if you run too far away, probably four more enemies will run out of the building by the gate. Additionally, they will also appear when the alarm starts.
Gold Bar! 6/10 - On the upper floor of the building to the right, by the gate.
Gold Bar! 7/10 - Inside the building to the left from where you began to go cross the square.
Gold Bar! 8/10 - In the tent nearby the tank.
Gold Bar! 9/10 - On the table by the entrance to the building through which you can get onto the gate.
Head inside the marked building [#6], from which you can get onto the gate. Firstly go up the stairs and climb into the attic, from which you can get onto the top of the gate using the rubble.
Gold Bar! 10/10 - On the Brandenburg Gate.
Objective 3: Don't let Wolff escape
As you step onto the gate [#7], Wolff will begin his car escape. It would be good if you weren't tired and could hold your breath - otherwise you just need to rely on your skills and don't let him escape!