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You're only copying the original here, then making changes to it. Changes are in red so we can see what you've changed and evaluate the merit of those changes. PLEASE DO NOT double our work by doubling the information. Only in instances of a complete rewrite would we have any need of seeing the entirety of the original description but, if your entire update is red, we'll go look up the original ourselves. Tyger7's post below
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Tomb Raider: Legend 
Glitch patched or otherwise no longer works.
My edits are in Red
Completed all Time Trials
Complete all levels while in time trial mode.
After you have
a level on any difficulty, you can replay load
that level and choose Time Trial. Choose this and complete the level under par-time.
It is recommended that you start with the last level (Bolivia: Redux) first as that will unlock the one shot kill cheat which makes all the other time trials MUCH easier. There is no level specific achievement for Bolivia: Redux but it is required for this achievement to unlock.
If you have a hard time completing those levels on Time Trial, you could use this glitch:
Load the specific level on Time Trial mode
Watch the intro of the level
Press and exit to Main Menu
Select the same level but don’t change anything on the settings, DON’T even select Time Trial, just continue.
Play through the level and make sure you don’t die to early in the level.
After you died the first level and loaded the last checkpoint, you’re Timer will start. So if you play till the end of the level or just to the middle, you shouldn’t have trouble completing the level before you’re out of time. Though, you’ll have to die at least once to start the Timer, otherwise you won’t get rewarded the Achievement.