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.
1 Lvl completed
Start Game
Music 1
Mute
Music 11
Bandit 3 Dead
11 Lvl completed
10 Lvl completed
Music 10
9 Lvl completed
Music 9
8 Lvl completed
Music 8
7 Lvl completed
Music 7
6 Lvl completed
Music 6
Middle Game
Bandit 1 Dead
Bandit 2 Dead
5 Lvl completed
Game Over
Music 5
4 Lvl completed
Music 4
1/3 of the game
3 Lvl completed
First Restart
First Death
Music 3
2 Lvl completed
Music 2
Pause 2
Pause
End Game
12 Lvl completed
Jump
Go Left
Music 12
Fall
Go Right
Last Step