Here is the full list of all 42 Mini Knight achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Mute
End Game
12 Lvl completed
11 Lvl completed
10 Lvl completed
9 Lvl completed
8 Lvl completed
Bandit 3 Dead
7 Lvl completed
6 Lvl completed
First Restart
Game Over
5 Lvl completed
4 Lvl completed
3 Lvl completed
2 Lvl completed
1 Lvl completed
Bandit 2 Dead
Bandit 1 Dead
Last Step
Music 12
Music 11
Music 10
Music 9
Music 8
Music 7
First Death
Jump
Go Left
Go Right
Music 6
Middle Game
Music 5
Music 4
1/3 of the game
Music 3
Music 2
Pause
Pause 2
Music 1
Fall
Start Game