Vs. Roach mode
Complete the 1st mission in dungeon mode.

Panzerfaust EX
Win the game in Vs. Roach mode to unlock the Panzerfaust EX in Vs. Roach Mode with unlimited ammunition.

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

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

Better partner
Win the game to raise your partner level to 4 in arcade mode. Win the game a 2nd time to raise your partner level to 8 in arcade mode.