The Orange Box

For this storyline achievement you have to hold out against multiple combine troops for a few minutes. They give you three turrets to cover four doors. The standoff isn't too hard but here's a few things you can try if having trouble:

- Pile boxes and barrels to block entryways and deny entrance
- patrol turret placements to keep them standing
- smash supply boxes before placing turrets to save time
- there is a second story balcony to get to with stacked boxed, hide there with turrets and watch for grenades.

To make this achievement easier, you can actually carry and use the turrets from the first encouter and use them at this point giving you five turrets for 4 doors and it isnt all that much more effort then leaving them behind, secondly now you have 5 turrets if you set them up in the middle of the corridors facing the doors by the time the combine have got to them to try and knock them over, they are dead, of course grenades will knock them over but the extra guns mean most of the time you wont be taking any damage. Also the 5 turrets can be taken from here through the rest of this chapter, when you come to a load/save point just usethe gravity gun to shoot the turret through the save/load point and they will be there once the point has passed. I found this out on my first play through because i didnt want to leave my good buddy turrets behind.