Harvey Yeah, I totally understand that working for you, but for me, there are years of muscle memory based on my current setup, so changing something means years more of learning a different dpi. Thanks for all the help, and the reason I brought up the mouse acceleration thing was because I personally think it should be a setting for every desktop environment, rather than being enabled by default across the board. Thanks again!
Harvey Gnome Tweaks isn't opening even after reboot?
Nothing, shows up in start menu when searching 'tweaks' though
[deleted]
Thats... Odd. Even if it doesn't run properly it should provide some output.
Search for broken packages and reinstall any that are broken:
sudo eopkg check | grep Broken | awk '{print $4}' | xargs sudo eopkg it --reinstall
If you're not copying and pasting the command note it is case sensitive.
If you're worried about running weird commands its referenced in the official troubleshooting documents so you know its not suss. https://getsol.us/articles/troubleshooting/general-troubleshooting/en/
EDIT The command will take some time, its not frozen.
Harvey 
Tried twice, copied and pasted both times..
Harvey Same issue, but if I type 'sudo gnome-tweaks' it works?
To disable mouse accel in budgie use Dconf editor
sudo eopkg it dconf-editor
Once you've got it installed, navigate to /org/gnome/desktop/peripherals/mouse/
In there you'll find and option accel-profile. Click on it, uncheck the default value button, underneath the custom value button will become available. Click on that and set it to flat.
Now just match your windows sens with your linux one. 
TeenCorn but like it's still a different sensitivity
For DPI try Piper. It works for my Logitech mouse, not sure about yours.
Otherwise the GNOME-tweaks should work like others have said.
TeenCorn As I said, I can't deal with "the same feel." years of gaming on pc means I have muscle memory to the exact precise sensitivity I've been using in games.
Snoober My mouse retains dpi settings, so that part shouldn't be an issue.
The only other way I can think of is to find a game that does not use raw input and use a measuring tape to find your cm/360.
So, find out you're cm/360 in Windows and then match it in linux.
I know that CSGO can turn off raw input.
This are just my thoughts. I don't know if doing this will actually work.
TeenCorn Doing something like that would be very precarious and not precise, I would need an actual program to simulate mouse movements, which would have to be completely accurate across windows and linux if I were to do anything like that.
I don't know what you mean by that. I'm assuming you switched to the flat profile. Even if you do that, you still have the adjust the mouse speed in the system settings and the DPI on your mouse. Mess with the combination of those things until you get the same feel as in Windows.