These are the Kaiju that Tetsujin-28 fought against.
Branch Robo No.1
Branch Robo No.2
Titan Robo
Burdon
Ghoster
Gigantic Octopus Kraken
Gamda No.1
Alien
Branch Robo No.3
Deathram
Fake Tetsujin
Veracruz
Shirakuma Robot
Ultra Crusher
Dragon Robot
Guilder
Ei Robot
The Great Devil(Branch Rob No.4)
Scorpion
Sphinx Robo
Branch Robo G No.5
Centipede
Kairyu Robot
Hiyu-ba Robots
Branch Robo No.6
Space Robo No.1
Space Robo No.2
King Kong
Kung Fu Robo
Challenger 1
Buffalo Robo
Space Robo No.3
Thunder God Thor
Tokageron
Kanigiran
Giant Spark
Korudon
Thunder Fighter
Democres
Space Robo No.4
Salamander Robo
Mummy Man Robo
Shinigami Robo
Carlos' robot
Raidan
Tarantula
Icarus
Space Robo G No. 5
Space Robo 6
Space Robo 7
Space Robo No. 8
Robi