Here is the full list of all 36 The Mighty Quest For Epic Loot achievements.
Loot 100 items
Loot 15 castles that are lower level than your hero
Place 25 creatures in your castle
Loot 5 castles in a row
Loot 10 castles in a row
Loot 20 castles in a row
Equip your hero with a piece of armor in every equipment slot
Reach level 5 with any hero
Loot a castle at a higher level than your hero
Defeat 500 creatures
Defeat 1500 creatures
Defeat 5000 creatures
Loot 15 castles that are the same level as your hero
Loot 15 castles that are higher level than your hero
Use 20 healing potions
Use 50 healing potions
Use 100 healing potions
Slay 100 Spiders
Slay 50 Vampires
Defeat 50 boss creatures
Place 50 creatures in your castle
Place 100 creatures in your castle
Build a 5 room castle
Build a 6 room castle
Build an 8 room castle
Your castle claimed the lives of 10 heroes
Your castle claimed the lives of 20 heroes
Your castle claimed the lives of 50 heroes
Collect a total of 50,000 gold
Collect a total of 200,000 gold
Collect a total of 500,000 gold
Get 10 friends in your network
Reach level 30 with the Knight and the Archer
Defeat 10 friend castles
Loot 200 items
Loot 500 items