Achievements...
	Rorschach: Ultra combo...

Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
Detective ( 15 points )	Find all abilities and pickups in Nite Owl mode.
Exterminator ( 8 points )	Perform 250 finishing moves.
Hero ( 36 points )	Complete the game in Nite Owl mode.
Psycho ( 36 points )	Complete the game in Rorschach mode.
Retaliator ( 8 points )	Perform 200 counter attacks.
Shield ( 8 points )	Dodge or block 25 incoming attacks.
Strong Arm ( 8 points )	Knock 100 people over, by throwing other people into them.
Teamwork ( 36 points )	Complete the game in co-op mode.
Thief ( 15 points )	Find all abilities and pickups in Rorschach mode.
Turbo ( 11 points )	Complete the game in less than 80 minutes in one session, without restarting from a checkpoint.
Untouchable ( 11 points )	Go unharmed for an entire level, without restarting from a checkpoint.
Vigilante ( 8 points )	Eliminate 20 bad guys in 101 seconds.

Have Rorschach's area attack, fast area attack, and knockdown ability. Then, press [Heavy], [Light] two times, [Heavy] three times to execute a devastating combo.