Since there were no guides for Jump King, I thought I'd give it a shot. The goal of this guide is to explain how to get all achievements, with occasional screenshots and videos. (So potential spoilers if you want to find the secrets on your own.) Some of the achievements are pretty self explanatory, while others aren't as simple. Nonetheless, I wanted to put all the achievements in one place. If you notice any errors or don't understand an explanation, let me know, and I'll try to fix them. Good luck on getting your achievements!

Should also be noted that at the time being achievements unlock once the game is closed.

The achievements for the amount of times you have jumped or fallen. To check and see the total amount of jumps and falls you have, you can go to the menu, select "Extras," and then "Total Stats."

Jump Squire
- Jump 1,000 times.


Jump Knight
- Jump 10,000 times.


Jump Lord
- Jump 20,000 times.


Just the Beginning
- Fall 100 times.


Thick Skull
- Fall 1,000 times.

Almost every non-player character has an achievement linked to them (at least in the original map). Most of the achievements are gotten by simply talking to them a certain amount of times. To quickly talk to them repeatedly, you can save and quit in front of an NPC, select continue, and then they will have some new dialogue. Alternatively, you can idle in front of them.

Talkative
- Talk to the Old Man at the start of the game 10 times.


Apprentice of the Pond-Sage
- Talk to the Old Man 40 times until he no longer has anything left to say. He gets new dialogue the higher up you go. So if he stops talking for a bit, go a little higher and jump back down. I'm still trying to see how high is necessary to get all the dialogue, but it might be required to go to the top of the Tower and go back down to access all dialogue.

Barter
- Talk to the Merchant in Bargainburg 4 times.


Meditations
- Talk to the Hermit on the final screen of the Great Frontier 10 times.


Off the Beaten Path
- Talk to the Imp. The Imp is in a hidden room in Bargainburg. Going left from this point in the image will lead you to the Imp's lair. This is also the way to get to New Babe+.


Cute Cat
- Find the hidden 9th cat in the House of Nine Lives. (Cats count as NPCs, right?)


King & the Gang
- Talk to the Gargoyles playing music in the Halted Ruin. The moment you get to them, just idle a bit through their dialogue.

The achievements relating to all items and collectibles.

Fowler
- Keep jumping after the raven up until Chapel Perilous, where it will drop the Gold Ring. After you pick it up, complete the game.

Fashionable
- After getting the Gold Ring, jump down to Bargainburg and the Merchant will take it in exchange for the special shoes, giving you the achievement.

Big Spender
- Collect the Gold Ring 9 times, then once you have collected it the 10th time, give all 10 to the Merchant and the achievement will unlock. To keep the ring through each playthrough, you can select "Give Up" on the pause menu after collecting the ring. It will close the game and delete the save, but once you start a new save, the ring will be in your inventory. Completing the game isn't necessary to keep the ring, but it works as well.

Large Feet
- Buy the Giant Boots from the other Merchant in the Lost Frontier. You'll need 10 Silver Coins. If you've beaten New Babe+ once, you'll need to collect all 10 again. Here is a video showing all coin locations.


Favour of a Higher Being
- Receive the Snake Ring. To get it, jump after the white bird up until the snake in Black Sanctum. The bird will now be holding the Blood Red Stone. Follow it back down to Brightcrown Woods where it will now drop the stone. Pick it up, and go back up to the snake. The snake will take it, giving you the achievement.

Deadly Outfit
- Wear the Magical Crown, Giant Boots, and Snake Ring simultaneously.


Disciple of the Forest Scholar
- Get the Scholar's Hat. It is on the last screen of Philosopher's Forest, in front of the bearded gnome.

True Scholar
- Receive the Tunic. The bearded gnome will give it to you once you have collected all 9 Mushrooms in Philosopher's Forest. Here is a video of all their locations.


Helping a Brother Out
- Receive the Yellow Shoes. To get them, collect all 4 Ghost Fragments and give them to the pink guy at the start of Moulding Manor. The fragments are invisible but make a sound when collected. Here is a video showing their locations.


Gnomed Out
- Wear the Scholar's Hat, Tunic, and Yellow Shoes simultaneously.


King of the Flies
- Get the Bug's Note. Chase after the fly in Bugstalk and eventually it will drop it. The fly will have the note the 39th time it appears.

Regal Attire
- Receive the King's Cape. To get it, chase after the red bird in Ghost of the Babe until the end. When you beat it, the bird will fly down and give it to you.

Bird Outfit
- Wear the Shoes, Snake Ring, and King's Cape simultaneously.

These achievements are for completing the game and its DLCs under specific conditions.

Jump King
- Complete the game.


Double King
- Complete the game wearing the crown.


Fashion King
- Complete the game wearing the shoes you buy from the Merchant.


Swift Jumper
- Complete the game within 1 hour.


Lightning-Speed Jumper
- Complete the game within 15 minutes.


Godlike Jumper
- Complete the game without falling.


New King+
- Complete New Babe+.


Giant Leaps
- Complete the game wearing the Giant Boots. Start a new save with them already equipped.


Absolute Will
- Complete the game wearing the Snake Ring. Start a new save with it already equipped.


Giant Leaps+
- Complete New Babe+ wearing the Giant Boots. Start a new save with them already equipped, and make sure you start from the Redcrown Woods (original map) or else the achievement will not unlock.

Absolute Will+
- Complete New Babe+ wearing the Snake Ring. Start a new save with it already equipped, and make sure you start from the Redcrown Woods (original map) or else the achievement will not unlock.

Mad King
- Complete New Babe+ without falling. Starting from Redcrown Woods for this one isn't required, so you can start from the beginning of New Babe+ and it will still unlock.

Exorcist King
- Complete Ghost of the Babe.


Haunted Jumper
- Complete Ghost of the Babe within 1 hour.


Possessed Jumper
- Complete Ghost of the Babe within 30 minutes.


Giant Leaps Ghost
- Complete Ghost of the Babe wearing the Giant Boots. Start a new save with them already equipped.


Absolute Will Ghost
- Complete Ghost of the Babe wearing the Snake Ring. Start a new save with it already equipped.


Nobody's Perfect
- Complete Ghost of the Babe with only 2 falls. The game forces 2 falls, so you must beat the game with 0 unintentional falls.

The achievements that didn't really fit in any other category.

Fool's Paradise
- Reach Chapel Perilous. You'll get this in the process of beating the game.


Fool me Twice...
- Avoid disturbing the raven in the cages section of Colossal Drain, and then complete the game.

You'll want to jump up on that platform from the middle cage and ignore the cage to the right, so you don't disturb the raven.

Detective
- Enter a hidden wall.

This is an early hidden area you can access to get the achievement.

Archeologist
- Find the stone nose in the first screen of the Lost Frontier.

Going left from this point to the stone nose in the corner will prompt dialogue saying you've discovered it, giving the achievement.

Blue Ordeal
- Reach Deep Ruin. You'll get this in the process of beating New Babe+.