Here is the full list of all 38 Ary and the Secret of Seasons achievements.
Finish the game in less than 5 hours
Finish the game without completing any side quests
Finish the game without dying once
Finish the ending credits and discover the epilogue!
Finish 9 stork towers
Take down an enemy from afar
Obtain all the hearts
Defeat the Winter Golem
Defeat all four Season Golems
Defeat the Spring Golem
Kill 500 enemies
Let 25 enemies perish by other enemies
Create a mushroom chain reaction
Slide without interruption for 5 seconds
Defeat the Autumn Golem
Open 50 chests
Defeat your first Mandrake
Destroy 100 spheres with black crystals
Cast each season sphere 200 times
Defeat the Summer Golem
Gain 1 life heart
Cast all seasons in one place
Roll 100 times
Get trapped by Crocus
Free the children and escape the mine
Get the Guardians' revelation
Jump 1000 times
Open 25 chests
Defeat Muscari
Meet with the Guardians for the first time in a long time
Complete 10 quests
Engage Prince Crocus
Kill 5 enemies in less than 15 seconds
Break 6 pots at once
Get out of Yule
Open 1 chest
Witness the season change
Appear almost identical to Flynn