This happens all the time, don't worry.
One player wins the game after backstabbing all other players on one of the harder two difficulties
One player uses a phoenix feather to revive three people at once
One player wins the game on 'Brutal Insanity' difficulty with no backstabs
Defeat the Dark Archer on one of the harder two difficulties
Defeated the Dark Rogue on one of the harder two difficulties
Defeat The Skeleton King on one of the harder two difficulties
Win a game on 'Brutal Insanity' difficulty with no friends
Defeated the Dark Warrior on one of the harder two difficulties
Kill 1000 Enemies In One Round on one of the harder two difficulties, then complete the round
Defeated the Spider Queen on one of the harder two difficulties
Defeated the Dark Wizard on one of the harder two difficulties
One player wins three rounds
Search Every Room in a Dungeon
Wow...You quit before you even played