Here is the full list of all 19 5 Crowns achievements.
The base game contains 9 achievements, and there is 1 DLC pack containing 10 achievements.
Keep Agraé alive in Chapter 6
Protect Goldy during Chapter 5
Defeat Boson during Chapter 5
Recover a dagger abandoned in the desert
Reach level 10 with Athéo in Cursed Legacy difficulty
Finish chapter 2 in under 20 turns in Cursed Legacy difficulty
Open all chests in chapter 5 in Cursed Legacy difficulty
Reach B rank in bows with Aaron in Cursed Legacy difficulty
Defeat all deserters in chapter 3 in Cursed Legacy difficulty
Take no hits with Aaron in chapter 1 in Cursed Legacy difficulty