You will also be completing police cases, a total of four spread out into several missions each. There are a total of 30 story missions for you to complete. To start things off, simply play through the game. Step 1: Play through the game doing whatever side missions and collect any collectibles you come upon, at your leisure. Minimum number of playthroughs required: 1.Estimated time to platinum: 25+ Hours (PS3) / 30-35 Hours (PS4).