Bioshock Xbox 360 secret achievements.
Carry out the following tasks to get the corresponding number of Gamerscore points:-
Became a Big Daddy (30 points) Become a Big Daddy.
Broke Fontaine's Mind Control (30 points) Break Fontaine's mind control.
Completed Cohen's Masterpiece (30 points) Complete Sander Cohen's great masterpiece.
Defeated Andrew Ryan (30 points) Defeate Andrew Ryan.
Defeated Atlas (100 points) Defeat Atlas.
Defeated Dr. Steinman (15 points) Defeat the crazed Dr. Steinman.
Defeated Peach Wilkins (15 points) Defeat Peach Wilkins.
Found Cohen's Room (10 points) Enter Sander Cohen's personal quarters.
Irony (10 points) Take a picture of Sander Cohen's corpse.
Restored the Forest (15 points Restore the forests of Arcadia.