Here is the full list of all 20 Loot Hero DX achievements. It takes around 3-4 hours to unlock all of the achievements on Windows.
Reach Level 100
Defeat 10000 Enemies
Reach Level 50
Collect 100000 worth of Loot
Slay the Dragon on Difficulty 90
Reach Level 25
Slay the Dragon on Difficulty 45
Defeat 1000 Enemies
Slay the Dragon on Difficulty 18
Clear the Volcano
Beat a level in under 15 seconds
Clear the Dark Forest
Clear the Jungle
Get one upgrade medal
Collect 1000 worth of Loot
Clear the Swamp
Defeat 100 Enemies
Clear the Woods
Buy one of each upgrade
Buy an upgrade