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