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