Here is the full list of all 13 Feudal Alloy achievements.
Open all the chests.
Finish the game.
Defeat the final boss.
Find all the lockets.
Activate all the modules.
Use all the data cartridges.
Find all pieces of the map.
Activate all the teleporters.
Spend 20000 coins.
Hoard 15000 coins.
Put on a complete equipment set.
Defeat the first boss.
Hit a scarecrow 10 times.