Here is the full list of all 75 Wandersong achievements. It takes around 12-15 hours to unlock all of the achievements on Windows.
Killed the final boss
Kicked a bard 10 times
Kicked a bard 3 times
Killed the Dream King
Killed the King of Hearts
Killed the Sun's King
Killed the Moon's Queen
Killed two Overseers at once!
Did a slow clap at an appropriate time
Saved the city from a monster attack
Helped victims of war find a safe place
Killed Queen Order
Killed the Queen of Winds
Launched by a lightbulb
Defeat 3 Owls
Defeat an Owl
15
Defeat 7 Spinnies
Spin your sword for a while
Defeat 3 Spinnies
Reflect 30 attacks!
Reflect 20 attacks
Defeat a Spinny
Reflect 10 attacks
Reflect 3 attacks
Reflect an attack
20
7
5
3
Charge a lightbulb
100
15 Stompies
50
7 Stompies
10 with charged sword
4 things 1 bolt
Hit 5 with a charged sword
25
3 things with 1 bolt
3 Stompies
Defeat 15 bats
Hit with a charged sword
Defeat a stompy
Defeat 7 bats
Defeat 3 bats
Hit 3 things with lightning
Defeat a bat
Chain 2 things with 1 bolt
Charged 100 bolts
Charged 50 bolts
Charged 40 bolts
Charged 30 bolts
Charged 20 bolts
Charged 10 bolts
Charged 5 bolts
Charged 2 bolts
40
30
10
Did 30 dashes
Did 20 dashes
Did 10 dashes
Did 5 dashes
Did a dash
Jump 5 times
Killed Queen Chaos
Defeated the boss of the Ruins
Defeated the Troll