Wacom has existed for over 40 years. In that time they've released many different drawing tablets.
In this document I'll point you to different lists of tablets depending on what you're interested in.
You can see a list of all the tablets Wacom currently sells on their website (https://www.wacom.com). However, this information does not cover the tablets they historically sold.
Tablet expert Kuuube maintains a Kuuube's Wacom tablet mastersheet which as far as I know lists every Wacom drawing tablet ever made.