Here is the full list of all 13 Bravery: Rise of The Last Hero achievements.
Discovering the first cave
Defeat your first Mini Boss
Help Severin at the farm
Defeat your first Boss
Get saved from a trap by someone
Take a trip
Become a Beginner Hero
Spend the night at the inn
Tell a little lie
Drink something of doubtful origin
Be an extremely charitable person
Cause 500,000 damage to enemies
Defeat 200 creatures of the night