I wanted to give some advice to those people attempting to get the Tunnel Vision Achievement.
1) Be all about grabbing the orbs in certain areas of the gauntlet, and strictly dodging in others. Areas you just want to dodge are the ares with EMPs and the area with the more pyramid shaped obstacles.
2) It is possible to grab orbs before and after obstacles. Inching along the side of orbs will allow you to grab them without a direct collision.
3) When dodging, less is more. Slight movements to the left and right are all that are necessary most of the time. Keep an eye ahead and be ready to zig-zag if you see a series of clumped obstacles.
4) Try to stay in the center so you have two ways to go instead of one. Staying on the edges only gives you one way to escape.
Hope this helps. Keep at it!