Here is the full list of all 77 Next Hero achievements.
Death from purchasing items in a Dark shop
Achieve village level
Kill the Succubus
Kill the King Mushroom
Acquire all armor
Kill the King Zombie
Kill the Horseman Commander
Achieve highest level of mercenaries
Building a museum in town
Completed all the quests
Kill the King Fire Slime
Kill the King Bat
Kill the King Toad
Kill the Chief Cannoneer
Kill the King Ice Slime
Kill the King Slime
Kill the King Cobra
Saw the credits.
Kill the Chief Mage
Kill the King Harpy
Kill the Golem
Construction of a pub in a village
Monastery construction in the village
Marry Sofia
Kill the Dragon
First cleared Stage 5
Kill the King Salamander
Kill the Chief Ninja
Collect 10 Hearts
Have more than 30 Bombs
Enter the Colosseum 3 or more times in a game
Kill the King Turtle
Kill the King Rabbit Slime
Construction of a blacksmith in a village
First cleared Stage 4
Kill the Chief Archer
Kill the Snow Worm
Find a secret room more than 3 times in one game
Kill the King Shark
First cleared Stage 3
Open more than 10 Boxes in a game
Kill the King Yeti
Have more than 100 Golds
First discovered a Secret room
Kill the King Octopus
Kill the King Toothtrap
Construction of a mercenary small town
First cleared Stage 2
Kill the King Jellyfish
Kill more than 100 Monsters
Kill the King Lynx
Have more than 10 Equipmets
First cleared Stage 1
Kill the King Goblin
Break more than 100 Objects
Kill the Siren
Kill the King Kobold
Kill the Knight Commander
Kill the King Bomb Slime
Kill the King Skull
Have more than 30 Keys
Drink more than 10 Potions
Blacksmiths achieve highest level
Achieve the monastery's highest level
Achieve the bar highest level
Establish a statue of all monsters in the museum
Left the Village
Killed the Elder.
Marrying Diana
Completed item collection
Completed monster collection
Acquire all weapons
Acquire other items
Acquire all loot
Thank you for playing