Here is the full list of all 15 Hunter's Legacy achievements.
Achieve a 100% game completion
Acquire all bow upgrades
Talk to all inhabitants of Iripur
Acquire all health upgrades
Find all ores in the game
Find all hideouts of Rampelkimpers
Acquire all sword upgrades
Collect a total of 2500 currency
Upgrade your wallet to its fullest
Activate all teleporters
Finish the game
Beat the game without a single upgrade
Shoot 300 arrows
Make a Kobold drop its shield
Kill 200 enemies