REDSEC Damage in Match Challenge

I completed a match with 5300 damage, 27 kills, and yet the Challange > Assignments > Skills only completed the 4000 damage tier one.

Is this one seriously locked behind it, so if you get a great game and get 5k damage but hadn't gotten a 3k damage game, it only bumps up the 3k one, or in my case the 4k one to 5k? This seems absurd... it's hard enough as is to get 5k damage game, only to be gated by the fact I hadn't done a 4k damage game prior??