No missable achievements (plus 20 unknown)
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Clear the Woods
Defeat 100 Enemies
Clear the Swamp
Collect 1000 worth of Loot
Clear the Jungle
Clear the Dark Forest
Get one upgrade medal
Defeat 1000 Enemies
Clear the Volcano
Slay the Dragon on Difficulty 18
Reach Level 25
Collect 100000 worth of Loot
Beat a level in under 15 seconds
Slay the Dragon on Difficulty 45
Defeat 10000 Enemies
Reach Level 50
Slay the Dragon on Difficulty 90
Reach Level 100