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