Trophy description - Found all the bonuses.

Trophy - Silver

This is the only collectible trophy in the game. There are a total of 22 collectibles scatter across the chapters. Only 20 of them can actually be found while the last 2 are story related. Additionally, Aiden is the only capable character of seeing and picking them up and not Jodie. They look like blue aura orbs floating around ground, but they can be collected by pressing the L1 Button and then use both the Left and Riht stick to line the purple orbs in the middle to collect it after holding the orbs steady for a couple of seconds. You'll know you've collected them when the bottom screen says 'You have unlocked a New Bonus'. It's important to note that once you collected a collectible; you'll have it forever as they disappear from the chapters they were found in. Each collectible will unlock additional content such as videos, art and trailers.

If you have already finished the story, then you can collect everything by either starting a new game or use chapter select and quitting to the main menu after finding them. There's no need to reach the next checkpoint.