GTA Online: Earn 30 Platinum Awards.
There are a total of 85 Awards available Grand Theft Auto Online. These awards are essentially a set of small challenges that range from getting a certain number of kills with a weapon to changing your outfit a number of times and winning a few rounds of the different sports and around San Andreas.
While most awards have different tiers of medals - Bronze, Silver, Gold & Platinum - there are exactly 22 challenges that will net you a platinum award upon immediate completion. Once you have earned at least 30 Platinums, you will unlock the achievement. Remember, you can always check your progress for these Awards by following these steps: PAUSE > STATS > AWARDS.
Please utilize THIS THREAD for a checklist of all 85 Online Awards! This link also points out the 22 Platinum-only Awards and will provide great tips on how to get the easiest Awards during your Online play.