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