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The Orange Box: Portal Hints
Friendly Fire (PORTAL_HIT_TURRET_WITH_TURRET)
1 of 9: For this achievement, you need to use one sentry turret to knock another over.
2 of 9: Your first several chances to do this are in Chapter 8: Testchamber 16, though there will be more opportunities in future chapters.
3 of 9: Once you get to Chamber 16, you might as well use its first two turrets to get the achievement.
4 of 9: Pick up the first turret from behind and carry it along until you come to the corridor that the second turret is covering.
5 of 9: Drop the first turret so that it faces a corner and can't see you.
6 of 9: Duck out of cover just long enough to fire a blue portal at the wall behind the second turret.
7 of 9: Put the orange portal into any nearby wall, then pick the first turret back up and carry it through the portal.
8 of 9: Move toward the second turret so that the first one knocks it over, getting you the achievement.
9 of 9: In some areas, you can use portals to drop one turret onto another one, though this may be a bit harder to do.
