Unlock the Battle Game -
Beat Code Veronica X once to unlock the Battle Game. Chris and Claire Redfield will be available as playable characters. To unlock Steve Brunside, in the underground Save Room in Chris' walkthrough, complete the drawer puzzle in the corner. Take the Gold Luger to unlock Steve Burnside. To unlock Albert Wesker beat the battle game once with Chris Redfield.
Unlock the Rocket Launcher -
Complete the game and get an A Ranking to earn the Rocket Launcher. Anyhow it won't be easy. To get the A rank, you must not use First Aid Spray, not save your game, not retry, you have to save Steve from the Luger room quickly, give the Medicine to your jailer Rodrigo and finish in under 4h,30m.