Potential Weapon Upgrades that you can have on weapons is dependent on the mods you have enabled in your modlist. When supported mods are enabled, you will have a bigger pool of upgrades for this mod to choose from.

Here is the full list[docs.google.com] for your perusal. Refer to PIVOT sheet for summary. Maxed out, it supports 291 upgrades but let's be real. Enabling all mods will most likely result with conflicts. In my own personal modlist, I get 249 upgrades.

Alternatively, you could check Config/Upgrade Decks folders for template names (and potentially they are more up to date than this list).

Stukov released mods related to TLM that introduce more upgrades so you could grab these as well for more variety.

• Stukov's Tesla Loot Mod Balance
  
• Armour Upgrades - Stukovs War Plugin with Tesla Loot Mod integration

I don't mind taking requests, but its subject to my own discretion if I want to include them or not.

Edit: Steam hates Google Drive link. So here is the link for your copy paste pleasure.
https://docs.google.com/spreadsheets/d/1vezrDVGcETB00zF0vU1hUd66TFEZ63fDZJDe-_kZ-TQ/