As far as I know no Bretonnian miniatures were released during 4th edition (1992-1996). Many 3rd edition models, but not all, are found in the 1991 Citadel Catalogue (also called Red Catalogue). There are also many 2nd edition models shown in this catalogue so it is intended not to show them together with 3rd edition models here.
I found many models that are not shown or named in any publication (catalogue, White Dwarf). So I can't be completely sure if there are more unlisted models. It would be very much appreciated to get information on that.
All 3rd edition models were made from metal, but all horses were made from plastic. Miniatures before 1989 were in smaller scale (25 mm).
Bretonnian King and Bretonnian General (1989)
Bretonnian Knight Heroes (4 different models, 1990 or 1991)
Bretonnian Wizards (1989)
The left one was released as an Imperial Wizard, but was used by GW as a Bretonnian wizard in their studio army.)
Chevalier d'Honneur and Chevalier de Notre Dame de Bataille (1989)
Knight from the King's Retinue and Chevalier Rampant (1989)
Bretonnian Knights with Handweapon (10 different models, 1990)
Bretonnian Knights with Lance (10 different models, 1990)
Bretonnian Foot Knights (21 different models, 1990/91)
Mounted Men-At-Arms (8 different models, probably 1991)
Mounted Men-At-Arms with Bows (3 different models, probably 1991)
Retainers and Men-At-Arms (16 different models, 1990/91)
Archers (10 different models, 1990)
Crossbowmen (3 different models, 1990/91)
Crossbowmen (3 different models, 1990/91 and 1987). The right one was released in the "F4 Men-At-Arms" series in White Dwarf 96 from December 1987. This month there was also the release of the 3rd edition of Warhammer and the model was labeled as Bretonnian later in the "Red Catalogue".
Crossbowmen (6 different models, 1988)
Brigands (10 different models, 1990/91)
Breech Loading Bombard (1990/91)
Organ Gun (4-barreled, 1990)
Organ Gun (7-barreled, 1990)
Swivel Gun (1990)