Step 1: Complete the game on Hardcore, find all collectibles, and get all Combat-based Trophies
Your first objective in obtaining the Platinum Trophy is going through the game on the Hardcore difficulty first, as this will not only reward you with two trophies, but also open up the harder difficulties which you’ll also need to beat for the platinum. Whilst adventuring through Raccoon City, you’ll need to search every room in order to find all the Files, Charlie Dolls, and Weapons. Use this walkthrough to help find and do all that Raccoon City has to offer.
Step 2: Acquire the Infinite Ammo Weapons, 2 Defense Coins, and 2 Recovery Coins
Once you beat the game on Hard you’ll unlock a Shop in the Title Screen where you’ll want to purchase the Infinite Rocket Launcher, 2 Defense Coins, and 2 Recovery Coins. This will cost you 80,40P, so you’ll need to farm the points by completing the incomplete challenges on the easier difficulties.
Step 3: Complete the game on the Nightmare Difficulty / S-Rank
After you’ve racked up enough points and purchased the Rocket Launcher and coins, you’ll want to jump into the Nightmare difficulty and aim to complete the game in under two hours to get an S-Rank.
Step 4: Complete the game on Inferno / S-Rank (Inferno)
Once you’ve beaten the game on Nightmare you’ll unlock Inferno. This is the hardest difficulty in the game so you’ll want make sure you have the Infinite Rocket Launcher, 2x Recovery and Defense Coins, and the S.T.A.R.S. Field Combat Manual equipped to give you an advantage.
In order to acquire this S-Rank you’ll need to complete the game in under 2 Hours and have a max of five saves, so you’ll only want to be saving your game before every boss encounter.
Step 5: Wrap up any remaining trophies
All that’s left to do for is to wrap up any Trophies you may of missed, such as comnpleting the game without using more than one recovery item or using the Item Box. These Trophies are a lot easier to do on the easier difficulties.