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