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