I didn't get the technique upgrade in the Derelict Building on Hunter and Hunted on my first run through. The target is 6,000 and I only got 5,000 which is what you get for getting to the goal. I replayed the level from there and got 6,250 (I upped the difficulty to get a higher multiplier) but the technique upgrade didn't unlock.
Do I have to do it on the same difficulty I did it the first time? If so, how can I get an extra 1,000 points on that section? --- http://mypsn.eu.playstation.com/psn/profile/TheBorzoi.png
I managed to unlock it by dropping the difficulty back down to easy. It seems that the multipliers from the challenges were still in affect. --- http://mypsn.eu.playstation.com/psn/profile/TheBorzoi.png