Tomb Raider I-III Remastered Starring Lara Croft

Acquired in Temple of that Cat in the room with the three doors and six switches

Stand on the square in front of the second door to open the door at the far end. Run as fast as you can through this door (as it's timed).

Hopefully this makes sense, but I uploaded a video solution just in case

In the first room, push the block in front of you once (remember this block)
Turn to the right and jump through the small gap between the blocks into the corner.
Turn to face the other block (not the one you pushed) and you can jump through the gap into the second room

In the second room, push the block in front of you into the corner
In the tunnel, pull the block there twice
Jump through the gap into the tunnel

In the third room, pull the block once
Behind it, push the second block one
Jump through the gap into the fourth room and collect all the items

Utilizing the gap jumps again, make your way to the first room again.
Remember that first block you pushed? Push it now to reveal the switch that will open the door so you can escape with a secret and an achievement intact!

Please comment to tell me if this makes sense you all! If not, sorry

Note that it might take practice doing the jump gap

Around the end of the level "Temple of the Cat", you'll end up in front of 3 golden doors. Walk in front of the one on the center to trigger the opening of a door at the end of the alley. If it close again, just get back in front of the golden door, then do a save once you're in front of a movable block.

This is a little maze that consist of 4 rooms where you have to move blocks to progress. The 4th room contain the 4th and last secret of the level.

For this achievement, you'll have to get the secret AND get back to the main alley (there's a lever in the 1st room to re-open the door) without moving blocks more than 24 time (21 is the minimum).

The achievement pop once you're back in the alley.