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