Commands:

sensitivity sensitivity [Sensitivity] This command sets your mouse sensitivity to the specified value.
m_rawinput m_rawinput [0 / 1] This command enables raw input from your mouse, if set to 1 (default). When raw input is enabled, input is taken directly from your mouse and your operating system settings (like acceleration, delay, etc) will not come into play.
m_pitch m_pitch [Y Sensitivity] This command controls the sensitivity of your Y axis . That means it only adjusts your look sensitivity when looking up or down.
m_yaw m_yaw [X Sensitivity] This console command is used to adjust your mouse sensitivity only on the X axis , which is looking left/right.
m_customaccel m_customaccel [0 / 1 / 2 / 3] This command is used to choose what level of custom mouse acceleration you have. It can be set to disabled, or from a couple of choices.
m_customaccel_exponent m_customaccel_exponent [Start Point] This is the command that sets what speed you need to be moving your mouse before the custom mouse acceleration kicks in, if you have that command enabled too.
m_customaccel_max m_customaccel_max [Max Point] This is the console command that determines the limit for how fast your mouse can move depending on how fast you're moving it in real life. It can be set to have no limit.
m_customaccel_scale m_customaccel_scale [Scale] This is the command that determines what the value is for the custom mouse acceleration command. The higher this is, the faster your mouse acceleration will be.
m_mouseaccel1 m_mouseaccel1 [Value] This console command sets the mouse acceleration value for its initial threshold, up to 2x movement speed.
m_mouseaccel2 m_mouseaccel2 [Value] This console command sets the mouse acceleration value for its second threshold, up to 4x movement speed.
m_mousespeed m_mousespeed [0 / 1 / 2] This is the command used to set your preferences for Windows mouse acceleration.
cl_mouselook cl_mouselook [0 / 1] This console command controls how you look around in game. You can set it between your mouse (default) or your keyboard.
m_forward m_forward [Value] This console command is used to set the mouse forward factor.
m_side m_side [Side Factor] This console command is used to set your mouse side factor.