Sonny is game that many people love, so maybe this game should have achievements. There are few ideas I've got in my free time:
On land - easy - defeat first boss.
Even sensei must die - easy - defeat second boss
Good in legendary - medium - Equip legendary item in every slot
Last of them - medium - defeat third boss
Of baron and traitor - hard - Defeat baron and paladin
Clash of paladins - hard - kill paladin while having equiped every his item
Legendary champion - insane - win in void