Darkest Dungeon

Your first quest will be in the Ruins, so complete the first quest. Note that the tutorial quest before you reach the village does not count. So once your reach the village for the first time, listen to the tutorial and explore the buildings, hire some heroes etc. Once you’re ready, press the touchpad on the right side () to embark on your first quest. Again, listen to your tutorial and buy the supplies it suggests. Now start your first real dungeon crawl! Once completed the trophy will pop.

If it didn’t pop for whatever strange reason, you can pick the ruins from the regions map to again to do a quest there (see I've seen every corner of this ruined land... for details)