Here is the full list of all 10 Outcast Tales: The First Journey achievements.
Complete the tutorial.
Unlock the Antihero.
Deal 12 damage to an enemy in one strike.
Win a fight without taking damage.
Kill an enemy with a counterattack.
Win a fight with the only one outcast alive.
Acquire a pet dograt.
Win a poetry battle.
Lose a pet.
This tale ends, but more will open up in the future.