The following secrets have been revealed according to the main walkthrough. It would be best if you had them printed. Thanks to that, you'll be able to monitor your progress and you won't miss anything important along the way. Thankfully, you shouldn't have any problems finding most of them.
1/10 - Bronze
The first secret is located near the start (under the small rocks on your left).
2/10 - Bronze
Once you've reached the first pool, turn right. There's a small alcove here. The statue will be located inside.
1/5 - Silver
You should be able to reach the first rope very soon. Don't use the nearby ledge. Instead, you will have to turn left. There's a second entrance here (#1). It leads to a new cave. You will have to get there now. Turn on your flashlight and start moving forward. You should be able to reach the statue within a few seconds (#2). You don't have to go back to the waterfall. Keep moving towards the end of the cave. After that, climb down safely.
3/10 - Bronze
The statue is located on the left of the big movable platform. You shouldn't have any problems locating it.
4/10 - Bronze
The fourth statue is located by one of the waterfalls. You got there by using a rope. There's a small platform on your left (by the waterfall!). You will have to climb there and pick up the statue.
5/10 - Bronze
Once you've made your first double jump, keep moving forward. The statue is going to be on your left. Sadly, it's been hidden on an upper ledge. Thankfully, you won't have to climb there. Use the grapple and pull the statue towards Lara.
6/10 - Bronze
Use the rocks to get rid of some enemy soldiers. Once you're on a lower level, keep moving forward (#1). There's a small passageway here. You will have to use it. It'll lead you to the next statue (#2).
7/10 - Bronze
Once you've dealt with a guy who drops a machine gun (for the first time), don't use the nearby rope. Instead, head on to the lower level and turn right. There's a new statue here.
2/5 - Silver
You will have to deal with all of the remaining opponents. Once they're gone, stand in front of the temple. There are some platforms on your left (#1). Head on to the top level. Start shooting at the wall. Once it's gone, enter the new room and take your reward (#2).
Bronze - 8/10
You will have to deal with the first set of traps. Now you must search for an opening that's going to be located on your LEFT (#1). The small corridor will lead you to your prize (#2).
Bronze - 9/10
You will have to swim to the next cave in a few minutes. There's a small opening along the way. Head on to the surface (#1). You should notice a small platform here. The statue was hidden by the rocks (#2).
10/10 - Bronze
Once you've reached the room with the main puzzle, turn right and make a few steps forward. The statue is located on your right.
1/1 - Gold
I have to warn you. The golden statue is well hidden and you will have some serious problems getting it. Here's what exactly has to be done. Start off by acquiring two of the remaining boxes (use the movable platform). We're going to need only two boxes at the moment. Place them on the right and central button (#1). Ignore the third crate for the moment. Head on to the left button. You CAN'T stay on it, because you'll trigger the whole mechanism and you won't be able to reach your prize. Try running across the button. A very short cut-scene should appear on the screen. Now you will have to stand on the left button. Use the second screen for help (#2). You will have to wait for the gate to reach this position. Once it's there, leave the button QUICKLY! The gate should make a stop here.
Now you will have to reach the gate (the solution to this problem is displayed in the main walkthrough). DON'T head on to the new corridor just yet. Instead, try and use narrow ledges that are located on your left (#1). Make a jump towards a small ledge located on the gate. Climb up and enter a small room in order to pick up your reward (#2).
3/5 - Silver
Once again, DON'T even think about entering the new corridor. Turn right. There's a narrow ledge here (#1). Start moving towards the right edge of the screen. You will have to use some chains along the way. You should be able to reach the third silver statue very soon (#2). Pick it up and return to the main gate.
4/5 - Silver
You were able to see this statue during an interactive cut-scene. Once you've reached a new room, look for a movable part of the wall. You will have to start pushing it (#1). Once you're at the new corridor, turn right and head on to the new room. The silver statue is going to be located on your left (#2).
5/5 - Silver
The last silver statue is located in the same room. You will have to use movable horizontal poles to get to it. There are also some narrow ledges that will come in handy (#1). Make a jump towards one of the poles. You shouldn't have any problems reaching the statue (#2), especially since it's not hidden in any way. You can spot it from the ground floor.