This guide is oriented to AFK for a friend to get AC meanwhile he's getting achievements, or just to AFK host a match over an over. We are going to use an external Macro Recorder called Tinytask in order to save our mouse and keyboard clicks.

I suggest you to use the lowest resolution + windowed mode while doing this.

Before recording
• Play some matches and get enough AC to buy Infinite Ammo + One Hit to Kill rulesets. (I can't remember if you had enough AC to do it on start, but you need over 200 to buy them in the Loadout).
  
• Click in Custom Mode and HOST one match on Fort Fiesta, Showdown mode. I suggest you putting at least no ping limit to allow more people to enter there.
  
• Set the ruleset you want to before the match, and then press done.

Recording
• Open up Tinytask and press CTRL+ALT+SHIFT+R to start recording. After that, press the buttom to start the match. From now on, everything you do with your mouse will be saved, so be careful. I suggest you to just afk ingame and wait those 5 minutes.
  
• After the deathmatch, wait some second before pressing skip because the shotdown at the end can be longer than the first one, and we don't want a failed record. Remember that the key to stop the recording is (CTRL+ALT+SHIFT+R)
  
• Save the recording, set in the program options "Continuous Playback". Click on the game another time and press CTRL+ALT+SHIFT+P to start playing the record.

After recording
• Congrats! You are afking ingame. You can't do anything while doing this on the PC, but it's a simple and effective way to AFK. Have fun getting these achievements :)

This is my first guide, so if you find any kind of typo or suggestion just comment below. Thanks for reading :)