Tomb Raider I-III Remastered Starring Lara Croft

Tomb Raider Unfinished Business - Return to Egypt (Level 3)

You will enter the final area of the level after taking a long underwater passage and using a switch - some panthers will spawn in this part. On your left will be a fenced off area, ahead and around the right corner will be an alcove with some shotgun shells. Make a save facing this alcove head on. Run forward and try to stop right at the same line where the fence corner is. Immediately do a backflip, then do a running jump forward to clear the boulders as the roll down.

Video:

TR 1 - Unfinished Business - Level 3 - Return to Egypt

Near the end of the level, you will swim past some crocodiles and make it outside. After climbing out of the water make a save here. So if you take damage from the boulders you can just reload your save and try again. To the right after getting out from the water you will see some shotgun ammo on the floor, if you look up you will be able to see where the two boulders will be falling from. Get close to trigger them to fall, they will begin rolling towards you, run back and get ready to jump between the two boulders with a long jump. Achievement will pop shortly after you land. I made a short clip to show you the location and how I did it.

TR 1 - Unfinished Business - Level 3 - Return to Egypt

Near the end of the level, you will swim past some crocodiles and make it outside. After climbing out of the water make a save here. So if you take damage from the boulders you can just reload your save and try again. To the right after getting out from the water you will see some shotgun ammo on the floor, if you look up you will be able to see where the two boulders will be falling from. Get close to trigger them to fall, they will begin rolling towards you, run back and get ready to jump between the two boulders with a long jump. Achievement will pop shortly after you land. I made a short clip to show you the location and how I did it.

This can be achieved in the Return to Egypt level of Unfinished Business

After exiting the pool that takes you outside and killing the jackal/panther, head around the hieroglyph wall.
The two boulders will roll down the lower slope as you approach. Jumping over them should unlock the achievement.

Confirmation needed: The first time I swan dived over them without taking damage and nothing happened. The second time I jumped normally, took damage, lived and got the achievement. I'm not sure if you have to jump normally or if the achievement was delayed