It looks like the 93 Leaf promo set is missing. I don't know the full checklist. You can see some of the cards here:
https://www.comc.com/Cards/Baseball/1993/Leaf_-_Base_-_Promos,sl,ot,i12
Players shown on COMC include:
- Don Mattingly
- Juan Gonzalez
- Robero Alomar
- Eric Karros
Also I think the Frank Thomas that is listed as a variation here:
https://www.tcdb.com/ViewCard.cfm/sid/250/cid/16180251/1993-Leaf-195-Frank-Thomas
is not actually a base variation but rather one of these promo cards. You can see the similarities with the others - most easily I think the positioning of the name on the front of the card is closer to the Leaf stamp.