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
Reflect 30 attacks!
Reflect 20 attacks
Reflect 10 attacks
Kicked a bard 10 times
50
Did 30 dashes
Did 20 dashes
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
Did 10 dashes
Did 5 dashes
Did a dash
Killed Queen Order
Killed the Queen of Winds
Charged 50 bolts
10 with charged sword
40
Charged 40 bolts
Reflect 3 attacks
25
Defeat 3 Spinnies
Charged 30 bolts
7
30
5
Launched by a lightbulb
Charged 20 bolts
Hit 5 with a charged sword
3
Defeat an Owl
Defeat a Spinny
15
Reflect an attack
20
Charge a lightbulb
Defeat 15 bats
3 Stompies
Charged 10 bolts
10
Defeat a stompy
Defeat 7 bats
Hit 3 things with lightning
Jump 5 times
Charged 5 bolts
Hit with a charged sword
Defeat 3 bats
Defeat a bat
Chain 2 things with 1 bolt
Charged 2 bolts
Killed Queen Chaos
Defeated the boss of the Ruins
Defeated the Troll
Charged 100 bolts
100
3 things with 1 bolt
4 things 1 bolt
7 Stompies
15 Stompies
Defeat 7 Spinnies
Defeat 3 Owls
Spin your sword for a while