Hint: Life Upgrade Pedestals
Upgrade Pedestal 1: The first upgrade pedestal is right after you beat Shahdee. Walk up the stairs and you will see a tall altar. Pull it back to open a secret doorway behind it. Follow it throw avoiding the traps to obtain the first life upgrade.
Upgrade Pedestal 2 (Past): The second upgrade pedestal is in the area where you first fight the Crow Master. Make your way up the area to the stairway. You'll see a small metal grate. At the bottom of the stores to the left there are some barrels and a switch. Hit the switch, slow down time and make your way to the grate, roll under it. Go through avoiding traps to get the second life upgrade.
Upgrade Pedestal 3: When you reach the central hall after obtaining the serpent sword turn the turnstile lever so that it faces the doorway with the save point fountain. Facing the opposite doorway walk foreword and to the right, you'll see a ledge. Drop down and wall jump back and forth to make your way slowly down. Once you get down, drop down to the ledge below and wall run and jump off at the end and jump side to side to make your way up. Wall run again and at the end wall jump from side to side to make your way down to a ledge. Make your way to the doorway go through and avoid the traps for the third upgrade pedestal.
Upgrade Pedestal 4:When in the Mechanical tower you will eventually reach a Thrall who is throwing spike beasts. Get him to blow up the left wall (Your left when facing the Thrall) Walk throw and avoid traps to get the fourth upgrade pedestal
Upgrade Pedestal 5: When you get to the Garden in which you see the whole breathtaking scene make your way up to where you fight Silhouettes and Keepers. Walk to the left to find a ledge where the fence doesn't continue, drop down, move, drop down and wall run to make your way to the doorway across the gap. Walk in, make your way through avoiding traps to find the fifth upgrade pedestal.
Upgrade Pedestal 6: Once you turn on the water in Garden works via turnstile, wall run up the wall behind it, walk in make your way through avoiding traps to find the sixth upgrade pedestal.
Upgrade Pedestal 7: In the Prison area after you beat Thrall and make your way up. Make your way to the end of the left side and break a wall, you'll see a door. Head to the right side and midway throw you'll see another cracked wall. Break it hit the switch slow down time and make your way to the first wall you broke head throw and avoiding traps to find the sevenths life upgrade pedestal.
Upgrade Pedestal 8: Inside the library when you make your way up from the walkways beneath it. You see a broken doorway, make your way throw it and get to the railings. You need to jump to the other one and instead of heading to the ledge to the left, head to the opposing doorway (which is still intact) Jump to the ledge and make your way to the right side, jump up, and go through to find your way to the eight life upgrade pedestal.
Upgrade Pedestal 9: The ninth pedestal is located in the room in which you chase Shahdee and she shuts the door behind her. You are required to make your way up and to jump on a bar to open the door, as you make your way up you'll see a cracked grating. Come back here when you have the scorpion sword and break the grate to reveal a crate. Bring the crate out to the left wall, jump on it, wall run up and jump off to reach a ledge above it. Follow the area throw to make your way to the ninth upgrade pedestal.
With all pedestals found you will be able to get the Water sword which is in the room before the throne room. It will be in the center. The Water Sword gives you an alternate ending as it is the only weapon capable of defeating the Dahaka.

Hint: Life Upgrade
If you missed the life upgrade that is in the Clock Tower (in the room where you are getting Spike Beasts thrown at you), you can still get the upgrade later in the game by using the Scorpion Sword. After you get the sword and leave the library, you will break through a wall which leads into the Clock Tower. Instead of heading down towards the central chamber, head up and you will eventually reach the room where the Brute was throwing Spike Beasts at you. It doesn't throw them anymore but you can now break the wall on the left by using the Scorpion Sword.