Bioshock Tip

when you complete 'Cohen's Masterpiece' save the game while he walks down the steps(singing).... Kill him(although you dont have to) then take a picture of his dead body, another splicer will come after you its his wife...Kill her then take a picture of her dead body you would get an achievement called "Irony" then load your saved game and continue as normal(meaning you dont need to kill him) thats how i got that achievement