Deadfall Adventures

See my video here for solution. You have to select level 6: Mines. Short before the end of the first part of the level. In this hidden room you can also find a hidden treasure, so grab it before continue. Find it by switch to your compass. Its in a lore in the room.

Hey all, just a quick video for unlocking this achievement. It's in Mission 6, and it's before you ride the first minecart at the end of the area there on the right. There will be four minecarts in the way, and if you move them all(check video) you enter the area to get a treasure and the achievement. Hope it helps!