Here is the full list of all 24 The Weaponographist achievements.
Collect 10,000 Goop at one time.
Improve your leaderboard time for any level.
Rack up 200 kills in a single combo.
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.
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.
Massacre 300 demons in a single combo.
Get to Exp Level 8.
Collect two Health Runes in the same playthrough.
Raise one weapon to its absolute peak.
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.