Secret Report:
Collect all the messages in each level to unlock the Secret Report.

Vs. Roach mode:
Successfully complete the first mission in dungeon mode.

Panzerfaust EX:
Successfully complete the game in Vs. Roach mode to unlock the Panzerfaust EX in Vs. Roach Mode with unlimited ammunition.

Chris Redfield:
Successfully complete Inferno mission 6 to unlock Chris Redfield with a Linear Launcher with unlimited ammunition in dungeon mode.

Better partner:
Successfully complete the game to raise your partner level to 4 in arcade mode. Complete the game a second time to raise your partner level to 8 in arcade mode