Here is the full list of all 52 HunterX achievements.
Defeat a specific boss.
Complete the monsters in your Archive.
Explore every map.
Reach level 100.
Solve the special puzzle of Castle: Upper Floor.
Obtain 22 types of Occult.
Acquire the Spirit Sword.
Solve the special puzzle of the Born Tower.
Acquire the Icy Beam.
Obtain 15 types of Occult.
Successfully enhance an Occult.
Defeat the Witch in battle.
Solve the special puzzle of the Flame Dragon Temple.
Acquire the Priestess' Curved Blade.
Reach level 50.
Successfully enhance a weapon.
Defeat the Blacksmith in battle.
Penetrate an enemy with Shadow Dash.
Solve the special puzzle of Castle: Lower Floor.
Resurrect after getting caught in a trap.
Resurrect after being killed by a Debuff.
Acquire the Spider Saliva.
Obtain 5 types of Occult.
Destroy 666 Karma Crystals on the map.
Defeat the Priestess in battle.
Solve the special puzzle of Battle Ruins.
Parry an enemy's bullet.
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 199.
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 Acid Dragon.
Acquire the Flame Halberd.
Successfully enhance 1 type of weapon to max level.
Successfully enhance 1 type of Occult to max level.
Remove all equipment and defeat a monster.
Remove debuff.
Complete the items in your Archive.
Acquire all skills.