Here is the full list of all 24 The Weaponographist achievements.
Beat one Depth on Hardcore.
Banish the menace behind the dungeon.
Massacre 300 demons in a single combo.
Raise one weapon to its absolute peak.
Topple a seven story murderer.
Get to Exp Level 8.
Crush an ice wizard who was really only looking for a friend.
Collect 100,000 Goop at one time.
Collect two Health Runes in the same playthrough.
Dispatch a Terrible Lizard from the past. (Future?)
Destroy an angry marionette before it self-actualizes.
Attain a 100 kill combo.
Rack up 200 kills in a single combo.
Attain Exp Level 5.
Attain your first checkpoint.
Raise one weapon to its current level cap.
Improve your leaderboard time for any level.
Collect 10,000 Goop at one time.
Beat all Depths on Hardcore.
Unlock one jinx by playing Survival.
Unlock three jinxes by playing Survival.
Unlock all jinxes by playing Survival.
Reach and clear Room 10 on Survival Mode.
Reach and clear Room 30 on Survival Mode.