Here is the full list of all 24 Ancient Weapon Holly achievements.
Unlock all achievements
Defeat an enemy with a collapse for the first time
Defeat a Slayer
Defeat 50 enemies
Defeat 250 enemies
Defeat 500 enemies
Perform 10 enhancements, excluding recovery
Learn all enhancements, excluding recovery
Visit 10 lamps
Collect all memory parts
Clear the 6th underground layer
Clear the 1st underground layer
Witness the ending
Clear from the 10th to the 1st layer without ever experiencing game over
Defeat more than 5 enemies simultaneously
Open all treasure chests within the layer
Digest magma 30 times using a hole
Avoid attacks by entering a hole
Defeat 10 Slayers without being noticed
Use a melee attack
Move using teleportation
Receive damage from a trap
Drop a dragon into a hole for the first time
Complete the game in less than 3 hours in Time Attack mode.