This achievement is only obtainable once you find the Research Camera in Neptune's Bounty:
Every picture taken is graded, in order to unlock the achievement you must score an A.
Proximity is the key get as close as possible to the subject and snap a beauty.
Another tactic is to capture an action shot so if the splicer is attacking you / on fire etc and you are close enough you will get a higher grade.
You will at some point get this naturally, however try with every picture to get an A and you will gain the research bonuses and achievements far quicker