Game shares a lot in common with Borderlands 2.

Find the bolded part in PecanGame.ini (generally in Documents/My Games/Aliens Colonial Marines/PecanGame/Config

To remove head bobbing/sway:
[PecanGame.PecanPawn]
bWeaponBob=false
Bob=0.000
Some other tweaks in PecanEngine.ini

AllowRadialBlur=False
Bloom=False
MotionBlur=False
MotionBlurPause=False