Here is the full list of all 61 Legends of IdleOn - there are Idle MMO achievements.
Complete Stiltzcho's part of the Main Questline
Complete 25 Quests on a single character. They're called Quests but they're more like chores tbh
You've done better than people who ditch after a few hours!
Buy the Sculpting Tools so you can craft the town table
Claim 100 hours of AFK Gains. That's like 4 days and a side of fries.
10,000 copper coins worth, that's enough to buy 1400 nomwiches!
Create your 2nd character, who will probably never be as good as your 1st character.
Complete Glumlee's part of the Main Questline
Complete the Picnic Stowaway's part of the Main Questline
Choose one of the 3 starting classes, since like there are only 3 starting classes and not 4.
Reach the 2nd world, where there's lots of sand... I hate sand...
Reach world 3, the coolest world in the game!
You're easily in the top 50% of players now!
You've done better than most of my IRL friends who totally exist and aren't made up!
You're easily in the top 5% now, that's something to be proud of maybe kind of!
Your level is so massive it needs three digits! Just 4 more and you'll have a phone number!
1,000,000 copper coins worth, that's enough to buy almost 91,000 rolls of Cue Tape!
100,000,000 copper coins worth, that's enough to buy 3.8 million hot dogs!
Contribute 500 GP to your guild, proving you aren't that kid in the school project who lets others do everything!
Contribute 3000 GP to your guild, putting yourself above fellow members who only have the 500 GP achievement!
Contribute 20000 GP to your guild, which means your probably the best bow-wow in your guild!
Create your 4th character, who will never appreciate the struggle the earlier characters went through from having no family bonus stats.
Create your 8th character, who will never get the love and affection you gave your first few characters when making new characters was still special
Complete 75 Quests on a single character. Seriously these are just errands the NPC's didn't wanna do.
Comlete 150 Quests on a single character. The name speaks for itself.
Collect 10 unique cards. Who knows you may even get a Baba Yaga Rookie Card!
Collect 30 unique cards. If u wanna trade I got some spare Amarok cards!
Collect 120 unique cards. This basically makes you like, THE guy who does the card stuff!
Craft the Anvil II expander. More things to craft, yay!
Craft the Anvil III expander. More things to craft, again, yay!
Defeat the big poop and the giant house with legs!
Defeat the big hourglass and the toilet paper guy!
If u love me let me go... erm, I mean get a score of 13 in the Spike Minigame
Reach the top of the Giant Tree, then jump off... wait no don't do that last part.
Get a score of 103+ in the Mining Minigame, beating the Developer's score!
Get a score of 141+ in the Choppin' Minigame, beating the Developer's score!
Get a score of 67+ in the Fishing Minigame, beating the Developer's score!
Get a score of 128+ in the Catching minigame, beating the Developer's score!
Defeat your first Crystal Monster! These have a 1 in 2000 chance to spawn each time you defeat a normal monster.
Defeat 100 Crystal Monsters! This could go a couple rounds...
Defeat 2000 Crystal Monsters to become the Heavyweight Champion of IdleOn!
Defeat Amarok on Chaotic Difficulty. He's all bark and... well, all bite too honestly.
Defeat Efaunt on Chaotic Difficulty. Watch out for his new kick attack, and for all his old attacks since they're still deadly!
You kept the tutorial oil you get from the goblin?? You sneaker little gamer you!
You gave up all those peanuts just for a secret class... was it really worth it?
Shake it! To the left, to the left! Oh yea!!!
Hey, it was super cool to meet you gamer! Well, unless you called me LavaLame2, then it wasn't and I hate u :3 (Note - This achievement will also complete itself if you complete all other achievements)
Claim 2000 hours of AFK Gains. That's like 3 months but not really cuz u have multiple characters.
Claim 30,000 hours of AFK gains. That's like 2 years, but again it's really more like 2 months cuz you have so many peeps in ur squad.
Claim 111,000 hours of AFK gains. Jeez, ok that's like an entire year, even with all your character idling to the max lol
Equip any trophy. Well, almost any trophy, limited-time trophies don't count.
Your level has reached a point where people debate whether or not it is possible!
Defeat 5 Giant Monsters. You'll learn about these at the Prayer Rock in the Frostbite Tundra town.
Rank up the Explosive Combustion refinery chamber to rank 2.
Beat wave 50 of Wakawaka War without using more than 1 of any specific tower type. So just 1 boulder, 1 freeze, etc...
Get a Dementia Skull or higher on every mob within World 3 in the Deathnote feature. I probably don't have to specify "or higher" here lol
Defeat both mutant Minibosses: The Dilapidated Slush of World 3, and the Mutated Mush of World 4.
Trash 2500 pets. How could you be so heartless, so cold...
Reach World 4, the purple world with all the space stuff and things!