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
Slay the Dragon on Difficulty 45
Collect 100000 worth of Loot
Reach Level 25
Beat a level in under 15 seconds
Slay the Dragon on Difficulty 18
Clear the Volcano
Defeat 1000 Enemies
Clear the Jungle
Clear the Dark Forest
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
Reach Level 50
Reach Level 100
Slay the Dragon on Difficulty 90