Here is the full list of all 21 Funk of Titans achievements.
Try to obtain 3 gold medals in all levels of the Rock World
Complete every Zeus' Heroic Missions and reach your maximum potential!
Try to obtain 3 gold medals in all levels of the Rap World
Buy 25 items at the shop
Find the Pegasus Idol and ride with him across 50 bonus stages
Try to obtain 3 gold medals in all levels of the Pop World
Try to complete 30 Zeus' Heroic Missions
Find the Pegasus Idol and ride with him across 30 bonus stages
Buy 10 items at the shop
Find the Pegasus Idol and ride with him across 15 bonus stages
Complete all levels of the Rock world
Beat every Titan without a single fail during your dance moves
Try to accomplish 20 Zeus' Heroic Missions
Beat each Grunt of each world without a single fail during the confrontation
Complete all levels of the Rap world
Try to complete 10 Zeus' Heroic Missions
Complete all levels of the Pop World
Beat the first Titan and become a hero
Buy 5 items at the shop
Try to complete 5 Zeus' Heroic Missions
Beat a Grunt at the Colosseum