Gentleman Cambrioleur
Lockpick 20 chests.

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Some chests are locked and you need to have at minimum, the Apprentice Locksmith skill. I highly recommend buying the Journeyman and Master Locksmith skills as soon as you can, as it will help with opening doors as well. So, to open a locked chest, you first need to have some lockpicks. Lockpicks can be found on dead enemies, but the easiest way to get them is by buying them from merchants. Once you have some, go to any chest that is red on the map; this means it is locked. Interact with the chest as you normally would do. Now, you have to do a little lock picking mini-game. The aim is to press when the line gets into the "safe" zone. Some locks require you to do this twice, sometimes even 3 times, but most of the time you just need to do it once. If you miss the "safe" zone, a lockpick will break. All you need to do for this trophy is open 20 locked chests, and you will open far more then 20 while going for the Curiosity trophy.