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