Here is the full list of all 15 King Oddball achievements.
Gain five extra rocks during a level.
Kill the King.
Hit the King with a rock three times during a level.
Find and complete the Secret Moustache World!
Complete the Stash!
Complete all One Rock Levels.
Complete a level with one rock and gain more than one extra rock.
End the World.
Destroy six enemies with one throw.
Destroy a thousand enemies.
Throw a thousand projectiles.
Complete all Grenade Levels.
Complete a level using only one rock.
Destroy four enemies with one throw.