Minigolf :
1000 hole in ones - golden golfball and mini golf trophy
50 hole in ones - golfball themed ball race ball
Play all maps - minigolf poster
Ballrace :
Collect 100 melons - melon themed ballrace ball
Play all maps - ballrace poster
Collect 1000 melons - ballrace trophy
Virus :
Play all maps - virus poster
Infect 1000 players - infected playermodel
Infect 100 players - virus flame particle effect
Survive 1000 rounds - virus trophy
Little crusaders :
Turn off the dragon 1000 times - little crusaders trophy
Turn off the dragon 100 times - little crusader player model
Eat 1000 knights - ride-able dragon mount
Eat 100 kinghts - dragons button for avatar
Defeat the dragon with the birb 50 times - birb pet
Play all maps - little crusaders poster
These are just a few suggestions