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