Here is the full list of all 18 Iron Blade achievements.
Fuse items 20 times
Finish the Tutorial
Upgrade Fortress 5 times
Collect 10 Rare items
Open 5 Premium Chests
Purchase any Ruby or Bundles
Upgrade Fortress to Max level
Upgrade one item legendary to max
Upgrade one troop legendary to max
Collect a Legendary variant for each piece of gear.
Reach Level 100
Get 3 stars in all missions
Use 100 Raid Tickets
Ascend 5 pieces of equipment
Reach Level 110
Reach Level 50 in endless tower.
Complete 100 battles in events
Complete 100 battles in Boss Hunt