Play the secret first person battle mode:
     To  unlock  the  first  person  mode all you have to do is simply
complete the game.

Solution to the seven paintings puzzle:
     About  five  hours  in  on the first disc you'll find a room with
seven  paintings,  each  with a switch below it. In order to solve the
puzzle  you must press the switches below each painting in the correct
order. Below is the order in which this must be done.

1. Painting of the Woman
2. Man with two babies 
3. Man by himself
4. Man with plate
5. Man with book
6. Man with candle
7. Big painting 

Get the rocket launcher:
     To  obtain  the rocket launcher (NOT the linear launcher which is
the weapon used at the end of the game) finish the game with a rank S.
To  acquire  an  S  ranking,  you CANNOT save and retry (basically you
cannot  die  or  reset  the game at anytime) and you CANNOT use health
canisters  to  heal  yourself. You must also give the black man at the
start  of  the game the antitoxin and you must save Steve quickly when
he  takes  the  golden  guns  in disc 1. Also you must finish the game
within 5 hours.

Linear Launcher:
     Get an A ranking with the two Claires, Steve, Chris and Wesker in
the  Battle  Game  to unlock the Linear Launcher. Once you gain it, it
will  automatically appear in your inventory when you begin the Battle
Game again

Unlock Albert Wesker:
     Complete the Battle Game with Chris Redfield.

Unlock Steve in Battle Game:
     Solve  a puzzle in the main game. In the underground Save Room in
Chris' walkthrough, complete the drawer puzzle in the corner. Grab the
Gold Luger to unlock Mr. Burnside.