Here is the full list of all 14 Mini Knight's Journey achievements.
Finish the world 0.
Finish the world 1.
Finish the world 2.
Finish the world 3.
Finish the world 4.
Finish the world 5.
With Mini Knight, finish the game in Journey Mode!
With Mini Bond, finish the game in Journey Mode!
Finish the game in Classic Mode!
Defeat every boss without use any magic in Classic Mode!
Reach the level 5!
Reach the level 10!
Find the secret in World of Home.
Unlock the other achievements.