Here is the full list of all 12 THE KING OF FIGHTERS 2002 UNLIMITED MATCH achievements.
Take the perfect Roaring Sphere using Clark
In TEAM PLAY; defeat any of Krizalid, C.Zero, Zero, or Igniz
Defeat Ω Rugal and clear TEAM PLAY
Defeat Nameless the challenger
Clear all Normal Challenges
Defeat 10 opponents in ENDLESS
Defeat 30 opponents in ENDLESS
Defeat 65 opponents in ENDLESS
Get a clean hit with Galactica Vanguard using Ralf (available on Practice Mode)
Win a total of 10 RANKED MATCH
Win a total of 30 RANKED MATCH
Clear all Expert Challenges