1) Open Your PC Folder
2) Go to the following path C:\Windows\System32\drivers\etc
3) Copy-Paste the "hosts" file anywhere you want
4) Open the copied "hosts" file (with notepad)
5) Copy-Paste the following lines at the end of the file:

216.98.48.18 127.0.0.1
216.98.48.53 127.0.0.1
216.98.48.57 127.0.0.1
216.98.48.133 127.0.0.1
216.98.48.134 127.0.0.1
203.132.26.155 127.0.0.1

6) Save the file
7) Now move the copied "hosts" file into the path C:\Windows\System32\drivers\etc and replace the original one with the copied one
8) Enjoy your game

1) Open your game
2) Go to Settings/Options -> Graphic
3) In "Resolution" select any resolution you want but it must be at 60hz.
4) In "Vertical Sync" select the "On" button
5) Enjoy your game !

An example below:

1) Open your steam library
2) Search your game (Assassin's Creed)
3) Then right click it and click on "Properties..."
4) Go to Controller
5) Check if "Override for Assassin's Creed" is in "Enable Steam Input"
6) Then click to Controller Configurator

7) Click to your current Layout

8) Go to "Search" and search for "Gamepad Layout" by Jotriel.jpg

9) Click the layout to download it
10) After the download click on "Apply Layout"
11) Enjoy your game !

ps: Tested with the ps4 controller and everything worked