Another strategy for 'Skeet Shoot' which I found effective was, in the areas where there are skylines and enemies, ride on a skyline and get the enemies following you. Dismount from the skyline, and as the enemies drop off (they dismount very close to you), shoot them, preferably with a shotgun or hand cannon.
However, I'm not sure if it's just melee enemies who follow you on skylines, I think it might be.
Fallout 3 + Fallout 3 [PC] (1550/1550)
Fable 2 (1350/1350)
Mercenaries 2 (1000/1000)
Assassain's Creed II (1000/1000)
Call of Duty: World at War (1500/1500)
Fallout: New Vegas (1530/1530)
Fable 3 (1250/1250)
Call of Duty 4 (1000/1000)
LA Noire (1100/1100)
Forza Motorsport 4 (1250/1250)
Borderlands 2 (1375/1375)
BioShock Infinite (1000/1000)