All Weapons, Infinite Ammo, Medipacks
     Face  Lara  exactly  north,  then  enter the inventory. Highlight
Small Medipack and press L, Up, X, Up, R, Y.

Infinite LaserSight Ammo
     Combine  the  Crossbow  or Revolver with the LaserSight, Zoom in,
hold L and press Start. Select the Pistols and press A. Exit the pause
screen. All while still holding L.