Objective 1: Head to the checkpoint
Right at the beginning you will get the chance to kill the first soldier silently - if you care about points, you should consider using the pistol for that. Your target is the first checkpoint [#1].
Gold Bar! 1/10 - On the upper floor of the first building which you pass by on the left.
Wait for one of the enemies to enter a building. The second one will begin patrolling the area - hide behind a small wall on the pavement. Wait for the soldier to come as close as possible and silently kill him with the pistol. Look out, as on the roof of the opposite building there's a sniper - he's however not a big threat, as he's facing the other direction. You don't need to kill him.
Objective 2: Avoid the street patrols
Move further, towards the marked building [#1]. Right to the left of the entrance you will come across a soldier (the one who was patrolling the street previously) - eliminate him silently.
Gold Bar! 2/10 - on the dresser in one of the rooms on the ground floor.
Go up the stairs - look out for another soldier in the next room. Move onwards to reach a destroyed part of the building, where you will be able to jump down to the next room. Head out through the first window and go left - head back inside through one of the last ones.
Gold Bar! 3/10 - In the nook behind the suitcase, when you jump through the window to the back of the building.
Find yourself a way between the rooms to the main door leading out of the building. At this point you can try to lay low, though you most likely won't stay undetected for long. The Germans seem to have incredibly good eyesight and despite numerous attempt, they seemed to always notice me, even in absurd situations when I was behind cover. Additionally, there's a sniper on the other side, who will prevent you from coming too close.
However if you still want to try and kill at least some enemies quietly, leave the building and crawl to one of the vehicles [#3]. Afterwards throw a stone beside the wall - the soldier who was leaning against it should show up.
Keep crawling further - however do it very, very slowly. Try to reach the ruins on the right.
Gold Bar! 4/10 - Inside the ruins which you will pass by on the right, while avoiding the patrol.
At this point you should try to consecutively "call" the soldier to you by throwing stones - firstly somewhere on the street and afterwards inside the ruins [#4]. However you should get noticed very fast either way - apparently there's some kind of bug in the game which makes it impossible to complete this fragment stealthy.
If you decide to eliminate all of them from a distance, the best place to do that will probably be the window to the right of the entrance door [#2]. On the above screen you can see marked the place where the sniper is (almost perfectly opposite: ~240m, headshot: ~1 and 1/2 scale) and the one on the left where a soldier will appear beside the machine gun after the alarm starts. On the square in front of you there are five soldiers, another one on the right is leaning against a wall and behind the right corner there are two more. After clearing the whole square, head onwards towards the building entrance [#5].
Gold Bar! 5/10 - On the car, between the ruins which you pass by on the left, right before entering the next building.
Objective 3: Collect the explosives
After heading inside, you should restock on ammunition which can be found inside the crate. You should also note a soldier standing by the window two rooms further - eliminate him by sending a bullet into his head with the pistol.
Gold Bar! 6/10 - Inside the building, on the ground floor.
Move onwards - however before you head down, lean out through one of the windows - you should be able to see one soldier leaning against a wall - it's worth to eliminate him quietly now.
Gold Bar! 7/10 - beside the fridge, after going down the rubble.
Right before heading onto the street, you will find an ammo crate [#6] - use it to restock. At the same time two Germans should appear and note their dead companion. Hide behind a wall and wait until the enemies start searching for you - they should eventually start heading in your direction. If they don't use stones to lure them and shoot silently.
Your next objective will be heading to the other side of the street. Start off by hiding behind some cover [#7] and wait until the Germans face the other direction - use that moment to sneak to the other side, towards the explosive materials [#8]. Don't worry about the sniper, as he's looking towards the street.
Take the explosive charges. Now it's worth to take care of the patrol. From this position you can easily use stones to lure the soldiers nearby the advertising column - if you're lucky, two of the will come at the same time. If not, just repeat the whole thing again.
The third German can be easily killed by heading to the corner of the ruins. You can, but don't have to, kill the sniper - at this point no one should hear you shoot (however try not heading into the next street too much, as the three soldiers there might head you).