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