@EngineerRunner I guess you could (though i don't see why you would), but it still must follow the resource pack rules laid out here: http://bombch.us/DOOK
@2001WindowxpOfficial According to some people in the Javacord, the achievement 'Adventuring Time' is impossible in 1.7 due to a required biome being in the End, yet it is unobtainable when entering, therefore making All Achievements in 1.7 impossible.
There's also a tool called ModCheck which can make it so you have all the legal up-to-date mods. https://github.com/RedLime/ModCheck
Make sure you are using java 16+, there are instructions in the discord, just go to #bot-commands and type !!wp and you'll get the instructions.
There is a mod available in the discord, just go to the bot channel and type !!borderless, this mod is legal for use in speedruns. Other than this mod, I don't believe there is any other way to get Minecraft into Borderless mode.