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