1/5 - Bronze
Two of the bronze statues will be located near the start of this mission. They are both under water, by the first waterfall. The first statue is located on the right of the small island (the one with the mechanism). You shouldn't have any problems finding it.
2/5 - Bronze
The second statue is (as you've probably suspected) on the left.
1/4 - Silver
You will have to wait for the cut-scene. Once the entrance has opened up, jump into the water again. You couldn't reach a small tunnel before (#1). Now it's possible. The tunnel is located beneath the small island. There's a silver reward here (#2). Take it and get back to the entrance.
3/5 - Bronze
Once you've reached the cavern with two large wheels keep moving forward. There are some stairs on your right (#1). Make a single jump and collect a new statue (#2).
4/5 - Bronze
The next statue will be located by the main puzzle of this mission. Once you've dealt with a tiger, don't use the nearby stairs. Instead, go right. Here's where you'll find the statue.
2/4 - Silver
You're still in the same cavern. Before you decide to use the metal platform head on to the water and start swimming towards the left side of the screen. You should be able to find a suitable spot without any major problems (#1). Leave the water. The statue is on your right (#2).
5/5 - Bronze
The last bronze statue is located near the second pair of the stone blocks. Turn left before you decide to make a double jump.
3/4 - Silver
Once you've escaped a huge ball, you will find yourself in a new part of the temple. Turn left. There's a ladder here (#1). Use it to get to the ground floor. You'll find a silver statue here (#2). Pick it up. Use the ladder again in order to return to the entrance.
4/4 - Silver
You should reach a narrow ledge at some point. It's located by the small waterfall. You will have to make a jump towards the left ledge (#1). It's a little bit tricky, because you won't be able to see this ledge at first glance. Once you're there, use a grenade to blow up a brown door. Enter the new room and take your reward (#2). Go back to the right ledge.
1/1 - Gold
Once you've reached the large gate, stand on a movable plate (#1). Don't go to the new corridor, because that will trigger the boss fight. Instead, head back to the ground floor. You have to hurry! Once you're there, turn around and start moving forward. Don't worry, even if the door closes behind you, Lara won't be trapped here. Pick up the gold statue (#2) and go back to the top floor.