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
Kill 500 enemies
Break 6 pots at once
Destroy 100 spheres with black crystals
Obtain all the hearts
Finish 9 stork towers
Take down an enemy from afar
Let 25 enemies perish by other enemies
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
Slide without interruption for 5 seconds
Defeat the Autumn Golem
Cast each season sphere 200 times
Defeat the Summer Golem
Gain 1 life heart
Roll 100 times
Open 50 chests
Cast all seasons in one place
Get the Guardians' revelation
Free the children and escape the mine
Get trapped by Crocus
Defeat Muscari
Jump 1000 times
Meet with the Guardians for the first time in a long time
Defeat your first Mandrake
Complete 10 quests
Open 25 chests
Engage Prince Crocus
Kill 5 enemies in less than 15 seconds
Get out of Yule
Witness the season change
Appear almost identical to Flynn
Open 1 chest