Resident Evil 4

If anyone is trying to go for this achievement, here are a few things that I recommend doing: (1) Play through the game a few times on a lower difficulty to get a feel for the game. (2) Get the hand cannon in the Mercenaries mode. This can be done by getting an S rank on all stages with any character. I used HUNK for this since he is probably the best character besides Wesker. Then, get all of the upgrades for it so you can have unlimited ammo. (3) Save up your pesetas for the infinite rocket launcher. This costs 2,000,000 so you might have to save up for a while. (Bonus) I used this on my run yesterday and got it done in 3 hours: https://www.reddit.com/r/ResidentEvilCapcom/comments/13asmgk...
Credit goes to u/mab1984

So, that's it! Hopefully this will help somebody get this achievement. If there is anything I could have done better in this guide, please let me know in the comments since this is my first time making a guide.