Breakdown

Backfist: Hold Right and press L(3).
Block Roll: Click the "Left-Analog-stick" to block, then press Left or Right as you are hit.
Counter Attack: Click the "Left-Analog-stick" to block, then press R as you are hit.
Double-Punch Kick: Press L, R, R.
Hook Combo: Hold Right and press R, L, R.
Hook-Chop Combo: Hold Left and press L, R, L.
Low Kick: Press R, L.
Rising Elbow: Press "Run Up" + L + R, then press L.
Rising Upper: Press "Run Up" + L + R, then press R.
Roll Dodge: Press "Run Up" + L, then press Left(2) or Right(2).
Triple Punch: Press L(2), R
Uppercut Combo: Press L, R,L.

Successfully complete the game to unlock the "Trailer" option and all entries in the "Gallery" and "Sound Test" screens.

Pull the left analog stick down and then hit both the left and the right triggers at the same time. This will make Derrick perform a unblockable stomach punch and then toss his enemy behind him.

Successfully complete the game under the normal or hard difficulty setting to unlock the expert difficulty setting.

Immediately after pressing L to reload, press L3 to block. When L3 is released, your weapon will be instantly reloaded.

Pull the left analog stick down and then hit both the left and the right triggers at the same time. This will make Derrick perform a unblockable stomach punch and then toss his enemy behind him.

Hold [Block] then press [White], [Black].

Hold Block then press White, Black.