I've completed the par on each of the campaign levels. Here are the levels, scores required, and conditions that I had when I beat them.
Mombasa Streets: 100k (heroic, catch, tough luck, famine, thunderstorm)
Tayari Plaza: 25k (normal, catch, tough luck, famine, thunderstorm)
Uplift Reserve: 60k (heroic, catch, tough luck, thunderstorm)
Kizingo Boulevard: 75k (normal, catch, tough luck, thunderstorm, famine)
Oni Alpha Site: 60k (normal, catch, tough luck, thunderstorm, famine)
NMPD: 50k (heroic, catch, tough luck, thunderstorm, famine)
Kikowani Station: 50k (normal, catch, tough luck, thunderstorm, famine)
Data Hive: 50k (normal, catch, tough luck, thunderstorm, famine)
Coastal Highway: 60k (normal, catch, tough luck, thunderstorm, famine)
The only one where I came even close to missing it was on Tayari Plaza, on all the others I got 100K+ points. I've seen no effects from their completion. Given how easy they are to get I think they're just for show.