1/5 - Bronze
Once you've used the heavy machine gun, stay on the roof of the first warehouse. Turn right and start moving forward. You will have to reach a horizontal pole (#1). Use it to get to the roof of an opposite warehouse. Destroy the crate (it's on your right) and pick up a reward (#2).
2/5 - Bronze
Enter the main warehouse building. Don't use the ladder just yet. Instead, turn right and enter one of the nearby rooms (#1). The statue is hidden on your left (#2).
1/3 - Silver
First of all, you will have to reach a building with a large cross. There's a group of crates nearby (#1). Start shooting at them. Notice that there's a hole in the fence. Enter the new area. You shouldn't have any problems finding the silver reward (#2).
3/5 - Bronze
The next reward is located in a room with a destroyed train. Before you decide to use the second rope, make your way to the ground floor. There's a crate here. Destroy it and take your reward.
4/5 - Bronze
Once you've used one of the slipways (the one with the cables), make a jump towards a large horizontal pole (#1). Instead of using your grapple, jump down. You'll find a crate here. Destroy it in order to receive a reward (#2). You will be able to get back to the action by using one of the higher platforms (make a double jump here).
2/3 - Silver
You will have to reach the dark room with the generator. Turn right. There are some devices here. Use them to climb up a little (#1). Now you will have to start moving towards the left edge of the screen. Use the grapple to open a small gate. Make a jump towards the new part of the balcony. Destroy the wooden crate and pick up a silver reward (#2).
5/5 - Bronze
Once you've found the big device, use the slipway to get to the lower level. You will have to be moving near the right wall. Kill a single guard and pick up a reward.
3/3 - Silver
Once you've reached the top floor (body of a dead scientist should be somewhere nearby), turn right and start shooting at the small barrel (#1). The object will explode in a few seconds. Go there now. You shouldn't have any problems with finding the silver reward (#2).
1/1 - Gold
If you decide to go for the golden reward, you should know that it's going to be EXTREMELY HARD to get it. First of all, you will have to get closer to the huge cannon. Don't use it just yet. Instead, kill all of the surrounding soldiers. Use your machine gun. Enter the cannon. You will have to force the metal platform to start moving. The most difficult part is that it has to reach the end of the railway. You will have to be shooting at it (use the cannon) properly. The first screen (#1) shows exactly where it has to be placed. Don't leave the cannon. Turn right. Notice that there are some crates in front of you. The objective is to start pulling them (#2). Thanks to that, you will be able to use this small gap in the future.
You may leave the cannon. Head on to the right balcony. There's a large crate here. Start pushing it (#1). The crate must reach the opposite end of this balcony. Climb up and make a jump towards a small ledge (#2). Now you will have to start moving towards the left side of the screen. You shouldn't have any problems with the upcoming moves (I only hope that you have placed the large platform correctly :-)).
You will have to use a horizontal pole along the way (#1). You shouldn't have any problems locating it. Make a jump towards a small alcove. Pick up your reward (#2).