Here is the full list of all 75 Wandersong achievements. It takes around 12-15 hours to unlock all of the achievements on Windows.
Kicked a bard 10 times
Defeat 3 Owls
15
15 Stompies
Spin your sword for a while
100
7 Stompies
Defeat 7 Spinnies
20
Reflect 30 attacks!
Killed the final boss
Reflect 20 attacks
Reflect 10 attacks
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
Charged 100 bolts
Killed Queen Order
Killed the Queen of Winds
50
Defeat 3 Spinnies
Reflect an attack
Reflect 3 attacks
10 with charged sword
7
Charged 50 bolts
25
3 Stompies
Launched by a lightbulb
5
Charged 40 bolts
Defeat an Owl
3
Defeat a Spinny
4 things 1 bolt
3 things with 1 bolt
Charged 30 bolts
Charge a lightbulb
40
30
Defeat 15 bats
Did 30 dashes
Charged 20 bolts
Hit 5 with a charged sword
Hit 3 things with lightning
Chain 2 things with 1 bolt
Defeat a stompy
Defeat 7 bats
Charged 10 bolts
Did 20 dashes
Hit with a charged sword
10
Charged 5 bolts
Defeat 3 bats
Jump 5 times
Charged 2 bolts
Defeat a bat
Did 10 dashes
Did 5 dashes
Did a dash
Killed Queen Chaos
Defeated the boss of the Ruins
Defeated the Troll