1. Load the Map

In the game console (by pressing `~`), type the following command to load the sand traps map:




2. Load the cheats!



Enter the following commands:



This will allow you to fly.

3. Fly

Weeeeeeee!



Remember: don't touch the sand (duh)

4. Landing

Land on the ramp leading up to the end of the "Sandtraps" section, shown in the picture below:



Turn off no clip, and then turn off cheats:





5. Save and Quit

After turning off sv_cheats, resume the game and land on the ramp. Save your game and quit the game. Open the game up again and load the save file.

6. Profit

Walk up the ramp and victory is yours!

I hope this helped! Remember, you can still bypass the achievement so long as you reload your save file after using the noclip cheat.