Rorschach's ultra combo:
To perform a powerful combo, get Rorschach's knockdown ability, area attack, and fast area attack. Then, press Heavy, Light, Light, Heavy, Heavy, Heavy.
Exterminator - Perform 250 finishing moves.
Retaliator - Perform 200 counter attacks.
Shield - Dodge or block 25 incoming attacks.
Strong Arm - Knock 100 people over, by throwing other people into them.
Turbo - Complete the game in less than 80 minutes, in one session without restarting from a checkpoint.
Untouchable - Go unharmed for an entire level, without restarting from a checkpoint.
Vigilante - Eliminate 20 bad guys in 101 seconds.
Detective - Find all abilities and pick-ups in nite owl mode.
Hero - Complete the game in nite owl mode.
Psycho - Complete the game in rorschach mode.
Thief - Find all abilities and pick-ups in rorschach mode.
Teamwork - Complete the game in co-op mode.