This is an organized list (alphabetically) of the various action figures released in the Teenage Mutant Ninja Turtles toy line from 1988 to 1997 (the end of the Next Mutation line, and the final wave of figures released until 2003).
1988
April O'Neil
Bebop
Foot Soldier
Donatello
Leonardo
Michaelangelo
Raphael
Rocksteady
Shredder
1989
Ace Duck
Breakfightin' Raphael
Baxter Stockman
Casey Jones
General Traag
Genghis Frog
Krang
Leatherhead
Metalhead
Rat King
Rock 'N' Roll Michaelangelo
Sewer Swimmin' Donatello
Usagi Yojimbo
Wacky Walkin' Mouser
1990
Creepy Crawlin' Splinter
Donatello, with Storage Shell
Don, the Undercover Turtle
Giant Turtles Donatello
Giant Turtles Leonardo
Giant Turtles Michaelangelo
Giant Turtles Raphael
Fugitoid
Killer Bee
Leo, the Sewer Samurai
Mike, the Sewer Surfer
Mondo Gecko
Muckman & Joe Eyeball
Mutagen Man
Napoleon Bonafrog
Needlenose
Panda Khan
Pizzaface
Raph, the Space Cadet
Ray Fillet
Scumbug
Slash
Slice 'N Dice Shredder
Sword Slicin' Leonardo
Triceraton
Wingnut & Screwloose
1991
Antrax
Chrome Dome
Classic Rocker Leo
Dirtbag
Grand Slammin' Raph
Groundchuck
Head Spinnin' Bebop
Heavy Metal Raph
Hose 'em Down Don
King Lionheart
Leonardo with Storage Shell
Lieutenant Leo
Machine Gunnin' Rocksteady
Make My Day Leo
Michelangelo with Storage Shell
Midshipman Mike
Movie Star Don
Movie Star Leo
Movie Star Mike
Movie Star Raph
Pro Pilot Don
Punkin' Don
Rahzar
Raphael with Storage Shell
Raph, the Green Teen Beret
Rappin' Mike
Sergeant Bananas
Shell Kickin' Raph
Shell Slammin' Mike
Skateboardin' Mike
Slam Dunkin' Don
Slap Shot Leo
Space Usagi
Super Shredder
T.D. Tossin' Leo
Talkin' Donatello
Talkin' Leonardo
Talkin' Michelangelo
Talkin' Raphael
Tattoo
Tokka
Walkabout
Wyrm
Zak, the Neutrino
1992
5th Anniversary Collector's Turtle
April
April, the Ninja Newscaster
April, the Ravishing Reporter
Bandito Bashin' Mike
Beach Combin' Mike
Cave Turtle Leo and his Dingy Dino
Chief Leo
Classic Party Reptile Leo
Classic Clownin' Mike
Crazy Cowboy Don
Delta Team Don
Dimwit Doughboy Rocksteady
Doctor El
Giant Bebop
Giant Rocksteady
Halfcourt
Head Droppin' Don
Head Droppin' Leo
Head Droppin' Mike
Head Droppin' Raph
Hot Doggin' Mike
Hothead
Lifeguard Leo
Karate Choppin' Mike
Kooky Kalvary Leo
Kowabunga Kickboxin' Leo
Krang's Android Body
Merdude
Mona Lisa
Monty Moose
Movie III April
Movie III Kenshin
Movie III Princess Mitsu
Movie III Samurai Don
Movie III Samurai Leo
Movie III Samurai Mike
Movie III Samurai Raph
Movie III Splinter
Movie III Walker
Movie III Warlord
Movie Star Foot Soldier
Movie Star Splinter
Mutatin' Bebop
Mutatin' Donatello
Mutatin' Leonardo
Mutatin' Michelangelo
Mutatin' Raphael
Mutatin' Rocksteady
Mutatin' Splinter
Navy Seal Mike
Ninja Knockin' Bebop
The Original Teenage Mutant Ninja Turtles
Powerliftin' Don
Power Punchin' Rocksteady
Private Porknose Bebop
Raph, the Magnificent
Rock 'n Roll Mondo Gecko
Sandstorm
Scale Tail
Sewer Cyclin' Raph
Sewer Scout Raph
Spike 'n Volley Don
Super-Swimmin' Raph
Toon Burne
Toon Dask
Toon Don
Toon Irma
Toon Kala
Toon Leo
Toon Mike
Toon Raph
Toon Shredder
Toon Vern
Toon Zak
Track 'n Field Leo
Turtle Troll Don
Turtle Troll Leo
Turtle Troll Mike
Turtle Troll Raph
Yankee Doodle Raph
1993
Battle-Ready Boxer Mike
Cartwheelin' Karate Don
Cave Turtle Don and his Trippy Tyrannosaurus
Cave Turtle Mike and his Silly Stegosaurus
Cave Turtle Raph and his Tubular Pterodactyl
Channel 6 News Van with April (Green uniform repaint)
Don as Dracula
Giant Movie III Samurai Don
Giant Movie III Samurai Leo
Giant Movie III Samurai Mike
Giant Movie III Samurai Raph
Giant Movie Star Don
Giant Movie Star Leo
Giant Movie Star Mike
Giant Movie Star Raph
Giant Mutatin' Don
Giant Mutatin' Leo
Giant Mutatin' Mike
Giant Movie Mutatin' Raph
Giant Turtle Troll Don
Giant Turtle Troll Leo
Giant Turtle Troll Mike
Giant Turtle Troll Raph
Hot Spot
Jump Attack Jujitsu Raph
Leo as the Wolfman
Mighty Bebop
Mike as Frankenstein
Movie III Evil Warhorse with Castle Guard
Movie III Rebel Warhorse with Rebel Soldier
Movie III Turtlepult with Whit
Mutatin' April
Mutatin' Foot Soldier
Mutatin' Rahzar
Mutatin' Shredder
Mutatin' Tokka
Night Ninja Bebop
Night Ninja Don
Night Ninja Leo
Night Ninja Mike
Night Ninja Raph
Night Ninja Rocksteady
Raph as the Mummy
Rhinoman
Road Ready Leo
Road Ready Raph
Road Ready Shredder
Road Ready Splinter
Robotic Bebop
Robotic Rocksteady
Scratch
Somersault Samurai Leo
Super Don
Super Mike
Super Shredder (Chef Boyardee Exclusive Repaint)