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