Here are all the behaviours and titles:
SPOILERS
Fertile: Get plant breath and blow it on the town's crop fields.
Wild: Get plant breath and blow it on every thing you see.
Necromantic: Get health breath and heal every body, after stomping on them.
Healer: Get health breath and heal every wounded person. Don't heal dead soldiers or you will get "Necromantic" instead.
Fiery: Get fire breath. Burn everything but not people.
Rampaging: You don't need any special breath power. Eat or stomp everybody.
Reclusive: Walk straight, don't jump on, eat, or use any breath power, and stay on top of the castle.
Guardian: Stay on the castle without killing anybody.
Tyrant: Stay on the castle with everybody dead.
Watcher: Stay on the mountain without killing anybody.
Scourge: Stay on the mountain with every body dead.
I hope this helps!
-Snoopyfriend