Here is the full list of all 18 THE KING OF FIGHTERS '97 GLOBAL MATCH achievements.
Play MULTIPLAYER and win 20 times (excluding invite)
Play MULTIPLAYER and win 10 times in a row (excluding invite)
Play Multiplayer and win 5 times (excluding invite)
Clear the game with Hero Team (Kyo, Benimaru, Daimon)
Clear the game with Fatal Fury Team (Terry, Andy, Joe)
Clear the game with Art of Fighting Team (Ryo, Robert, Yuri)
Clear the game with Ikari Team (Ralf, Clark, Leona)
Clear the game with Psycho Soldier Team (Athena, Kensou, Chin)
Clear the game with Women Fighters Team (Mai, Chizuru, King)
Clear the game with Korea Team (Kim, Chang, Choi)
Clear the game with New Face Team (Yashiro, Shermie, Chris)
Clear the game with '97 Special Team (Blue Mary, Yamazaki, Billy Kane)
Clear the game with Sacred Weapons Team (Kyo, Iori, Chizuru)
Clear the game with '94 Females Team (Mai, King, Yuri)
Clear the game with Old SNK Team (Athena, Ralf, Clark)
Clear the game with Sidekick Team (Benimaru, Joe, Kim)
Clear the game with SNK Heroes Team (Kyo, Terry, Ryo)
Clear the game with Kyo & Shingo Team (Kyo, Shingo, any character except Leona/Iori)