Easy "Challenge Seeker" Achiev...
	Various Achievements...

To get this achievement you need to PLAY, not to FINISH, all the Challenge modes. So go to Story Contracts - Challenges (press Space), select the Contract Two (because in the first one you cannot do some of them), select a challenge, start the game, immediately exit, start another challenge and so on until you have got the achievement.

Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
...Now You Don't (30 points)	Hide while in view of an enemy five times during any single contract.
Body Removal Service (50 points)	Dispose of 150 bodies.
BOOM! Headshot! (10 points)	Get killed by a Shooter for the first time.
Catch Me If You Can (30 points)	Be pursued by an enemy for five seconds.
Challenge Seeker (20 points)	Play all Challenge modes.
Cleaner's New Threads (30 points)	Play a contract wearing an unlockable costume.
Done Cleaning (50 points)	Complete all story contracts.
Expert Collector (60 points)	Find all secret items.
Fashion Freak (50 points)	Unlock all costumes.
Hello Boys! (50 points)	Be pursued by at least three enemies simultaneously.
Here Comes A New Challenger! (10 points)	Check out any Challenge mode.
Hey, Listen! (30 points)	Get at least four enemies to investigate a sound decoy.
I Can See Clearly Now (30 points)	Complete any daytime contract 20 times.
I Will Survive (30 points)	Fail a contract five times during a single playthrough.
Made You Look (30 points)	Make an enemy react to a missing item or body bag 100 times.
Mommy's Little Boy (30 points)	Talk to Mom at home 15 times.
Moviegoer (80 points)	Complete all movie-themed bonus contracts.
Nocturnal (30 points)	Complete any night-time contract 20 times.
Novice Collector (30 points)	Find your first secret item.
Now You See Me... (30 points)	Escape capture five times in any single contract.
Out of the Frying Pan and into the Fire (40 points)	Use a shortcut to escape an enemy and then get caught by an enemy at the other side.
Squeaky Clean (30 points)	Clean 100% of blood in any contract.
Stickler (70 points)	Clean 100% of blood in all story contracts.
Tuned In (30 points)	Listen to the radio 15 times.
TV and Chill (30 points)	Watch TV 15 times.
Well Informed (30 points)	Read a newspaper 15 times.
Well Oriented (30 points)	Use Cleaner Sense for a total of at least 10 minutes.
Wheeee! (30 points)	Slide on blood for a total of 45 seconds in any single contract.