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