How to easily farm multiplayer achievements with bots

Firstly you will want to download the Ultimate Trainer here: https://www.nexusmods.com/residentevil5goldedition/mods/2

1. First unpack your file anywhere you want.
2. Launch the trainer with admin rights
3. Start RE 5. The trainer should instantly detect the game.

There are several achievements that would normally require long grind sessions. But there is a way to skip the timer and set your score quickly without needing to grind for several hours/days.

In the trainer, open up the Mercenaries/Versus tab. After that click on Player 2-4 Freeze. Then click at boxes with "is AI" on Players 2-4.
Ideally change their team from Alpha to Bravo.

Next click on "Single Player Versus Mode" that will open up a mode choice. Here you can set the mode to Slayers, Survivor, Team Slayer, Team Survivor. Pick the one you want to play.

Next you must open up The Mercenaries in RE 5. It will act as your selected mode (Survivors etc..)
Pick your map and character.

After you load into the game press pause and ALT+TAB to your trainer. On down right corner there are two settings you ideally want to change.

"Change Mercenaries Time" may reduce or increase the timer based on what you type. For quick end of the match type in "-1200" and press Set Time

"Change Mercenaries Score" increases or decreases your score. Type in how much score you want to have. But ideally for achievemenets type in "40000" or "80000" based on which achievements you need and Set Score.

After you change these settings ALT+TAB back into RE5 and unpause your game. If done correctly the match should end.

Repeat the process and you should be able to obtain some achievements.

Just repeat what was said before without setting the time and score. You just need to kill 20 or 40 enemiest without the combo meter refreshing.

Defeat 100 players with physical attacks. This one may take a while and some time to grind. You will need to shoot the bots until they are in a dying state. Then come up to them and punch them or kick them or whatever, you know the deal. Repeat that 100 times and the achievements is yours.

Special thanks to SheolDemon for helping me out with this guide.