forum.trle.net

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The game has been updated since the initial release.
Download it again and replace the TR4 and script file

And since I don't know if Michael has already updated it here, it's better if you download it from:
https://dl.tombraiderchronicles.com/trle/

Jorge, in the readme of this game there's a short walkthrough with only the main things to do.
I quote from there [...] the Locker Room Key (to use in the toilets area) and [...]

This is my fav CaC game I gave it 5 points!

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Roof of armory, right? In my end it does count as secret!
Odd

Lara Croft: I am Legend by Clara & masha, Laboratory

Amber Life by Inchdix
http://www.skribblerz.com/amberlife.html

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One piece is down the manhole in the armory (you need the access card)
The second piece is in an area (near the final temple) which you access from an underwater gate

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Thumbnails are ordered by builder's name. It's not a ranking.

Before you to use the thistles at the gate you can jump back to the beginning. This is also for a secret. From there you can make your way back through the watertunnel to the large water area. The first thistle is on the bridge after the swamp. You can take it after a timed run. Ok, but... I sugges...

You can use mine.
I also got the secret mentioned by @nad
I don't know if there were other secrets before.

You have to do a very beautiful timed run from the bottom (there's a lever) to the top.. inside that overhead door you noticed
Good luck!

Junior Level 1 by Xxenofex