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