Here is the full list of all 97 Just King achievements.
Defeat a boss using at least two lv3 Medusas.
Defeat a boss using at least two lv3 Cyclopes.
Defeat a boss using only Mythic heroes.
Defeat the coliseum rulers
Find the right weapon to defeat your foes.
Participate in the Dreekmocatic system.
Get fair pay for your work.
Defeat a boss using only Frenzy heroes.
Peace! Says the philosopher.
Defeat a boss using only Strategist heroes.
Defeat the boss with at least 2 Captains at lv 3 each.
Feed it.
Reach 200% Damage and 4 Armor only with items on a hero.
Defeat a boss using at least two lv3 Onis.
Defeat a boss using at least two lv3 Ronins.
Defeat a boss using only Yokai heroes.
Defeat the creature controlling the Bloodmoon.
Reflect on your limitations.
Concentrate to use your full power.
Defeat a boss using at least two lv3 Deep Cultists.
Defeat a boss using only Deep heroes.
Defeat a boss using at least two lv3 Sharkmancers.
Gift it with the hug of the great mother.
Defeat a boss using at least two lv3 Frost Witches.
Defeat a boss using at least two lv3 Vikings.
Defeat a boss using only Cold heroes.
Reach 200% Haste and 300% Heal only with items on a hero.
You need at least a PhD to blance magic and physics like that.
Be yourself.
What best adapts to changes.
Reach 10 armor only with items on a hero.
Defeat a boss using at least two lv3 Huntresses.
Find an old missing tree.
Get a rare seed.
Be the center of attention.
Pat the pettable ones.
Defeat a boss using at least two lv3 Druids.
Defeat a boss using only Woodlander heroes.
Feed the green.
Defeat the creature that stole the Throne of the Deep.
Now you see it, now you don't!
Play a song with your soul.
Defeat a boss using only Protagonist heroes.
A spear-sized baguette.
Defeat a boss using only Hot Hands heroes.
Ice is not always the answer for everything.
You must become a fighter!
Defeat the creature in the Mountain's Castle.
There is no quality material nowadays.
Defeat the creature that oppresses Trumwood.
Upgrade one hero to lvl3.
Gift of the high rank.
Win an Elite combat.
Win a combat without taking damage.
Win your first node combat.
Defeat the boss only buying Clerics and items.
Be defeated by nana on node 1.
Cause 666+ damage in a single hit.
You gonna need a lvl3 Cleric.
Get a MvP with Cleric lvl3.
Equip an Captain lv3 with Forgotten Banner, Chaplain's Pauldron and Shattered Saber.
Running is sometimes a good option!
Give Enzo tools to free himself.
Try to protect everyone without much success.
Make a foolproof plan.
Gotta run fazt.
Show off your power!
A helmet forged by great blacksmiths.
It's on fire!
Alleys too narrow to aim.
Perform a heroic move!
Defeat a boss using only Heavenly heroes.
Defeat a boss using only Shady Business heroes.
You can't catch up with nature.
Use advanced hunting tactics.
Slide very fast for a long distance.
Get hurt by using too much force.
Find a treasure that wants to be found.
Win a combat without dealing damage with heroes.
Fight for a noble cause.
Get a potion in the middle of the festival.
Show some of your faith during a tense moment.
Get rid of something important.
Impress them with your "luck".
Defeat the Shadow King with King.
Guarantee the party's security.
Get in touch with a distant relative.
Sculpt faster than sound
Create a whirlwind of jaws
Grow every kind of Krasis to its maximum potential
Defeat the Undead War God with max Red Trophies.
Defeat the Lightning Party God with max Blue Trophies.
Swat the one that bit you.
Remember your kelp roots.
Defeat the gods without ever gaining any Red or Blue Trophies in a run
Say prayers for each of the forgotten ones at the shrine.
Defend your thesis!