Here is the full list of all 52 HunterX achievements.
Solve the special puzzle of Castle: Lower Floor.
Acquire the Acid Dragon.
Defeat a specific boss.
Obtain 5 types of Occult.
Resurrect after being killed by a Debuff.
Destroy 666 Karma Crystals on the map.
Resurrect after getting caught in a trap.
Parry an enemy's bullet.
Defeat the Priestess in battle.
Penetrate an enemy with Shadow Dash.
Solve the special puzzle of Battle Ruins.
Obtain Occult.
Retrieve Karma.
Resurrect after being killed by a monster.
Parry an enemy's physical attack.
Reach the next level.
Destroy an enemy's bullet.
Reach level 50.
Reach level 100.
Reach level 199.
Defeat the Blacksmith in battle.
Defeat the Witch in battle.
Defeat a boss without taking any damage.
Defeat 5 types of bosses without taking any damage.
Defeat 10 types of bosses without taking any damage.
Defeat 18 types of bosses without taking any damage.
Acquire the Priestess' Curved Blade.
Acquire the Flame Halberd.
Acquire the Spider Saliva.
Acquire the Spirit Sword.
Acquire the Icy Beam.
Obtain 15 types of Occult.
Obtain 22 types of Occult.
Successfully enhance a weapon.
Successfully enhance 1 type of weapon to max level.
Successfully enhance an Occult.
Successfully enhance 1 type of Occult to max level.
Remove all equipment and defeat a monster.
Remove debuff.
Explore every map.
Complete the monsters in your Archive.
Complete the items in your Archive.
Acquire all skills.
Solve the special puzzle of the Flame Dragon Temple.
Solve the special puzzle of Castle: Upper Floor.
Solve the special puzzle of the Born Tower.