Here is the full list of all 38 Ary and the Secret of Seasons achievements worth 1,000 gamerscore.
Jump 1000 times
Finish the game in less than 5 hours
Cast each season sphere 200 times
Kill 500 enemies
Complete 10 quests
Cast all seasons in one place
Destroy 100 spheres with black crystals
Take down an enemy from afar
Kill 5 enemies in less than 15 seconds
Roll 100 times
Defeat your first Mandrake
Slide without interruption for 5 seconds
Finish 9 stork towers
Let enemies do the dirty work for you
Create a mushroom chain reaction
Break 6 pots at once
Finish the game without completing any side quests
Open 1 chest
Open 25 chests
Open 50 chests
Gain 1 life heart
Obtain all the hearts
Finish the game without dying once
Witness the season changes
Appear almost identical to Flynn
Get out of Yule
Engage Prince Crocus
Meet with the Guardians for the first time in a long time
Defeat Muscari
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!