Here is the full list of all 31 Idle Clans achievements.
Purchase the most glamorous property available
Reach level 100 in a skill
Create a godlike item
Grow some watermelons
Equip diamond jewellery
Battle a monster with an Outstanding weapon
Defeat a boss
Defeat a dragon
Receive a boss key
Achieved upon reaching your first million
Join a minigame
Enchant an item
Create silver jewellery
Purchase your first property. It's nothing to brag to your parents about, but it's a start.
Prepare a special dish
Refine an item
Purchase an upgrade
Plunder a small, helpless village
Perform a leaderboard search
List an item for sale
Join a clan
Complete the tutorial
Your first level up
Create a clan
Reach a billion gold
Reach max level in a skill
Steal from the royal clan
Eat a burger in battle
The true test for any respectable chef... Make a pizza.
Send an item to your clan's vault
Smith a piece of Astronomical armour