I decided to go after a couple of Achievements in my current game: It was a big Whale (all 10 heroes have the Whale trait) and Gluttons and Guzzlers (5 heroes with each fatal flaw). If anyone hasn't yet played the Whale trait, eating whale meat gives a 24-hour mood boost. I wish the creators of the game hadn't included whale hunting as whales of all sorts are rapidly becoming endangered or extinct, but oh well, it's just a game.
As for the fatal flaws, I think Drunkard is the easiest one to manage. But gluttons aren't too hard, particularly on 2-person quests. Just have one of the characters cook a large stew, then shift it back and forth between their inventories and they can both live on it all day.