I think this if my first post in this thread, and with a bit of luck won't be the last 
N7 challenges series (gold)
N1 - Recruiting all forces
N1.I - EDI
29:10 - Lvca_gr (277 979 pts)
N1.II - CDEM
35:20 - Lvca_gr (275 430 pts)
N1.III - Cyone must not fall
44:06 - Lvca_gr (210 520 pts)
N2 - Nature versus nurture
N2.I - Resolve of the Shadowbroker
30:02 - Lvca_gr (285 542 pts)
N2.II - Lay down the Lawson
43:09 - Lvca_gr (209 300 pts)
N2.III - 183 Pull-ups
70:29 - Lvca_gr (254 272 pts)
Cyone, Shadowbroker and Pullups were done more or less a month ago, and will probably be redone one of these days.
CDEM I did recently, when I noticed I maxed the Crusader, but will be redone too cause in this run I used AP ammo, and in the next one with Warp ammo, despite terrible objectives (two devices) got a sub30 run which I forgot to screenshot
. Probably the one I enjoyed the most so far. Wouldn't have thought a Crusader Paladin would be so fun.
EDI is an actual redo, and I'm more or less satisfied with it for now.
Lay down the Lawson was the one that made me stop doing challenges. I effin' hate Goddess. I retried it today, and the first run ended on wave 10 devices
. That one is the second, which I finally completed despite wave 6 devices. I don't see myself redoing it. 
Btw, I hope I got the formatting right, Prestacious.