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