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