Yu-Gi-Oh! 5D's Stardust Accelerator: World Championship 2009 Cheats

Unlocking Tag Duel Opponents (WC mode)
Other than defeating tag teams in story mode 5 and 10 times, here are the ways to unlock the rest of the tag duel opponents: anything under 1000 are LV1 duelists, anything above 1390 are LV 3 duelists, anything in between are LV 2 Note for the Summon requirements, for it to count it has to appear in the Duel Result to count (For example, the game won't detect Rainbow Dark Dragon when summoned using Rainbow Gravity)

Abyss Soldier/Neo Daedalus: Have 10,000 DP or more
Breaker Magical Warrior/Marauding Captain: Listen to tag explanation in story mode
Cyber Dragon/Drillroid: Summon Super Vehicroid Jumbo Drill
Cyber End Dragon/Chimeratech Overdragon: Reach 20,000 Attack point or more
Dark Armed Dragon/ Dark Monarch Gaius: Win Tag Tournament 3 times
DD Survivor/Wind Monarch Raiser: Riding Duel 200 times
E Hero Airman/D Hero Devilguy: Riding Duel 100 times
Exodia/Tragodiea: Win using Exodia's effect
FGD/Cyber Dark Dragon: Summon FGD
Golgar/Venominaga: Win using Venominaga's effect
Horseytail/Gokipon: Listen to tag explanation in story mode
Horus lv 8/Silent Swordman lv 5: Win 5 times against 20 tag pairs in WC mode
Medium of Ice Boundary/Flamevell Baby: Tag Duel 150 times
Mist Valley Soldier/Red Dragon Archfiend-Assault Mode: Summon Red Dragon Archfiend/Assault Mode
Rainbow Dark Dragon/Fire Wagon: Summon Rainbow Dark Dragon
Raioh/Batteryman Charger: win 5 times against 10 tag pairs in WC mode
Ruin/Demise: Win using Final Countdown
Simorgh Divinity/Simorgh Ancestry: Tag Duel 50 times
Spirit Reaper/Necrofear: Win using Destiny Board
Super Conductor Tyranno/Ultimate Tyranno: Tag Duel 200 times
The Splendid Venus/Summoned Skull: Win Tag Tournament 5 times

Unlocking Tournament
Tag Tournament: Unlock 20 Tag Opponents in WC mode
Tournament Lv 1: Unlock 15 level 1 tournament opponents
Tournament Lv 2: Unlock 15 level 2 tournament opponents
Tournament Lv 3: Unlock 15 level 3 tournament opponents

Unlock Jack's and Yusei's duel runner frames
To unlock Jack's and Yusei's duel runner frames,finish all time attack and battle races with a rank of S.

Jack's frame (Wheel of Fortune): Finish all battle races with S rank
Yusei's frame: Finish all time attack races with S rank

Unlocking Tournament
Unlock 20 Tag Opponents in WC mode

Unlockable Clothes
You've gotta duel with style and how uyou look represents who you are.

Dark Magician Costume: Beat the 2 Dark Magicians in the Duel Runner Store 5 times
King Replica Model (Jack Atlas Costume): Beat Jack Atlas in Turbo duel 10 times
Rock 'n Roller: Found During Story Mode
Security Uniform: Have 85% of Total Collection
Yusei Jacket: Beat Yusei in Turbo Duel 10 times

Unlockable Tag Partners
Partners you can use to team with in World Championship Tag Team battles.

Akiza: Duel 10 times & agree to be your partner
Bolt: Duel 10 times & agree to be your partner
Leo: Duel 10 times & agree to be your partner
Luna: Duel 10 times & agree to be your partner
Yusei: Duel 10 times & agree to be your partner