Here is the full list of all 33 Island SAGA achievements.
Get helpful tips from everyone in the guild.
Receive a guild card.
Mission Accomplished.
Get a tech spark.
Get ten tech sparks.
Get thirty tech sparks.
Execute a combination attack.
Execute twenty combination attacks.
Execute a five member combination attack.
Learn the Love Wall formation.
Learn the Prince Guard formation.
Learn the Square Dice formation.
Teach magic to the prince.
Defeat Quest 40's boss.
Defeat Quest 40's boss while having the difficulty set on hard or higher since the start of the game.
Slay the Boss Rat.
Squish the Ant Queen.
Vanquish the dreameater.
Meet Granma.
Can't spell JRPG without sewers and slimes.
Complete Quest 11.
The sequel of the prequel of the cinematic universe.
Complete Quest 27.
Super secret.
Use a balm.
The mad lad, he used an elixer.
Eat wagyu beef.
Master the ultimate martial arts tech.
Learn Cut Timber, an axe tech.
Master the ultimate spear tech.
Learn Swallow Reversal, an greatsword tech.
Eat a hamburger.
Reach Lv.30 in a school of magic.