This Seeking Tech guide will show you how to get The Early End trophy and achievement in the Master Collection version of Metal Gear Solid 3: Snake Eater.
This will unlock when you “kill The End before the boss battle.”
When you first arrive at Ponizovje South, make your way to the Northwest exit to enter Ponizovje West. In the new location, acquire the SVD sniper rifle in the small room and then return to Ponizovje South.
From there, head north to the Ponizovje Warehouse Docks. After the cut scenes end, save your game immediately just in case. You can then use the SVD to snipe The End from where you are standing.
You only have a limited amount of time to snipe him before he gets wheeled off. If you don’t kill him before he leaves, reload your save file and start again.
You can check out the video guide below if you need additional help: