Star Wars Rogue Squadron II (GCN) : Gold medal at 'Endurance' hidden mission (3 hours of dogfight against Tie fighters. 1300 kills)
Donkey Kong Country (SNES) - 101%
Resident Evil II (PC) - Beat the game in less than 3 hours for S rank
Mario Kart Double Dash (GCN) - 160 pts at the Grand Chelem (all tracks) in Mirror Mode
Doom (SNES) - Beat the game in Nightmare difficulty. (FYI Doom SNES has no saves)
SSBM (GCN) - Getting all characters and all tracks
Maniac Mansion (Atari 520ST) - Beat the game !
EVE Online (PC) - the F-T1ET rush : 2000 players involved
and more ....