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