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.
Slay the Dragon on Difficulty 90
Reach Level 50
Slay the Dragon on Difficulty 45
Defeat 10000 Enemies
Beat a level in under 15 seconds
Collect 100000 worth of Loot
Reach Level 25
Slay the Dragon on Difficulty 18
Clear the Volcano
Clear the Dark Forest
Clear the Jungle
Defeat 1000 Enemies
Get one upgrade medal
Clear the Swamp
Collect 1000 worth of Loot
Clear the Woods
Defeat 100 Enemies
Buy one of each upgrade
Buy an upgrade
Reach Level 100