Resident Evil - Survivor 2:

Unlock Panzerfaust EX for VS. Roach Mode:
Beat all 5 VS. Roach Mode lessons. 

Unlock Chris Redfield in Dungeon Mode: 
Beat the 6th Inferno mission. 

Unlock Rodrigo in Dungeon Mode: 
Complete all dungeon scenarios including Inferno mission 7. 

Unlock Secret Report: 
Get all the messages distributed throughout the levels. It will appear on the title screen. 

Unlock VS. Roach Mode: 
Beat the first Scenario in Dungeon Mode.