http://tasvideos.org/Movies-C2000Y.html
I enjoy this category (both TAS and playing for fun), but some games don't have a well defined way to account for 100% completion. For convenience, here's a list of games I'm aware of that has a percentage counter. Most of them don't have a TAS, so there's some ideas for 100%.
SNES
Donkey Kong Country (101%)
Donkey Kong Country 2: Diddy's Kong Quest (102%)
Donkey Kong Country 3: Dixie Kong's Double Trouble! (105%)
Super Metroid
N64
Donkey Kong 64 (101%)
GameCube
Billy Hatcher and the Giant Egg
Crash Bandicoot: The Wrath of Cortex (106%)
Crash Nitro Kart (101%)
Crash Tag Team Racing
Chicken Little (I think, need to recheck)
Lego Star Wars: The Video Game
Lego Star Wars II: The Original Trilogy
Metroid Prime
Metroid Prime 2: Echoes
Wii
Call of Duty 3
Call of Duty 4: Modern Warfare
Call of Duty: Black Ops
Call of Duty: Modern Warfare 3
Call of Duty: World at War
Lego Batman: The Videogame
Lego Batman 2: DC Super Heroes
Lego Harry Potter: Years 1–4
Lego Indiana Jones: The Original Adventures
Lego Indiana Jones 2: The Adventure Continues
Lego The Lord of the Rings
Lego Pirates of the Caribbean: The Video Game
Lego Rock Band
Lego Star Wars: The Complete Saga
Lego Star Wars III: The Clone Wars
Metroid Prime 3: Corruption
Metroid Prime: Trilogy
Kirby's Return to Dream Land
Xenoblade Chronicles X (Itemdex)
GB
Wario Land 2
GBC
Donkey Kong Land 2 (102%)
Kirby's Dream Land 3
Kirby Tilt 'n' Tumble
Wario Land 2
GBA
Crash Bandicoot: The Huge Adventure (101%)
Crash Bandicoot 2: N-Tranced (101%)
Crash Nitro Kart (101%)
GBA Disney's The Lion King 1 1/2
DK: King of Swing (200%)
Kirby & The Amazing Mirror
Kirby: Nightmare in Dream Land
Lego Knights' Kingdom
Lego Star Wars: The Video Game (Check if same as GCN)
Lego Star Wars II: The Original Trilogy
Madagascar (Not the same game as GCN)
Metroid Fusion
Metroid: Zero Mission
Monster House
Sabre Wulf
Ty the Tasmanian Tiger 3 - Night of the Quinkan (Not the same game as PS2)
NDS
Castlevania: Dawn of Sorrow
Castlevania: Order of Ecclesia
Castlevania: Portrait Of Ruin
Dragon Quest IV (Monsterdex?)
Kirby: Canvas Curse
Kirby: Squeak Squad
Kirby Super Star Ultra
Lego Batman: The Videogame
Lego Batman 2: DC Super Heroes
Lego Harry Potter: Years 1–4
Lego Indiana Jones: The Original Adventures
Lego Indiana Jones 2: The Adventure Continues
Lego Marvel Super Heroes: Universe in Peril
Lego Pirates of the Caribbean: The Video Game
Lego Rock Band
Lego Star Wars: The Complete Saga
Lego Star Wars II: The Original Trilogy
Lego Star Wars III: The Clone Wars
Lego The Lord of the Rings
Over the Hedge
Pokemon Trozei!
Ratatouille
The World Ends with You (Monsterdex)
PSX
Crash Bandicoot
Crash Bandicoot 2: Cortex Strikes Back
Crash Bandicoot 3: Warped (105%)
Crash Bash (201%)
Crash Team Racing (101%)
Spyro the Dragon (120%)
Spyro 2: Ripto's Rage!(120%)
Spyro: Year of the Dragon (117%)
Not TASable (yet):
PS2
Crash Twinsanity
Jak and Daxter: The Precursor Legacy (101%)
Jak II (125%)
Jak III (103%)
Ty the Tasmanian Tiger
Ty the Tasmanian Tiger 2: Bush Rescue
Ty the Tasmanian Tiger 3: Night of the Quinkan
PS3/PS4/XBox 360
Assassin's Creed: Brotherhood
Assassin's Creed II
Assassin's Creed III
Assassin's Creed IV: Black Flag
Assassin's Creed: Revelations
Call of Duty: Advanced Warfare
Call of Duty: Black Ops II
Call of Duty: Black Ops III
Call of Duty: Ghosts
Call of Duty: Infinite Warfare
Call of Duty: Modern Warfare 2
Far Cry 3
Far Cry 4
Lego Batman 3: Beyond Gotham
Lego Dimensions
Lego Jurassic World
Lego Marvel's Avengers
Lego Marvel Super Heroes
Lego Star Wars: The Force Awakens
Lego The Hobbit
Sleeping Dogs
The Lego Movie Videogame
3DS
Chibi-Robo! Zip Lash
Dragon Quest VIII
Dragon Quest Monsters: Joker 3 (Apparently similar to below)
Paper Mario: Sticker Star (Need to recheck)
Pokemon Sun and Moon (Percentage is in Pokedex. That counts I guess?)
Kirby: Planet Robobot
Kirby: Triple Deluxe
Lego Batman 3: Beyond Gotham
Lego Jurassic World
Lego Marvel's Avengers
Lego Star Wars: The Force Awakens
Lego The Hobbit
Rayman Origins
Shantae and the Pirate's Curse
The Lego Movie Videogame
I'm aware I'm missing more; please post if you're aware of others.
PC
Super Meat Boy (106%)
Edit: Changed some percentages. Thanks to those who posted.