Different Outfits: Beat game on Normal or Hard to get the closet key which unlocks the outfits.
Rocket Launcher, Submachine gun, closet key, Leech Hunter game: Get an S Rank (3 hours and 30 minutes or less)
Collect 1-29 Leeches in Leech Hunter to get submachine bullets for Becky.
Collect 30-59 Leeches for unlimited handgun ammo.
Collect 60-89 Leeches for unlimited hunting gun ammo.
Collect 90-99 Leeches for a Magnum in room 202.
Collect 100 Leeches for all weapons with infinite ammo.