Here is the full list of all 15 Ember Strike achievements.
Train a minion to level 3!
Convince Agnar to join your team!
Fight with two minions!
Learn to fight!
Beat the mini boss to unlock PVP!
Defeat Fang and save the Village!
Beat the raging orc!
Defeat Chairman Bao and save the valley!
Beat Chief Little Hands!
Defeat the Conjurer!
Train a party to level 3!
Train a party to level 10!
Get your fifth minion!
Win your first PVP match!
Win a PVP match with Fang!