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