I have the same issue including 2h axes, 2h hammers, pikes and whatever. It seems like I can't craft half of the weapons even though I do have some random blueprints for them.
I noticed this as well and it was really pissing me off so I dove into the xml files to see if I could fix this.
Turns out, I actually figured out a workaround!
This dropbox direct download link is for the crafting_templates.xml file. I have added a few things to the uncraftable items (one handed axe, two handed axe, throwing axe, one handed mace, and two handed mace) to make them craftable.
**** BACK UP YOUR SAVES AND FILES PRIOR TO INSTALLATION. I AM NOT RESPONSIBLE FOR ANY CORRUPTED SAVE OR GAME FILES ****
To install this:
1. Go to steam and right click on Mount & Blade 2: Bannerlord
2. Hover over manage and select browse local files
3. Enter the Modules folder
4. Enter the Native Folder
5. Enter the ModuleData folder
6. Drag the downloaded crafting_templates.xml into the folder and replace the old one
7. Boot the game and load into any existing or new save
I'm going to be looking into making this an easy to install mod within the next few days so keep an eye out!