An Achievement System is a system where players are rewarded for doing MMORPG activities like exploring a new area, crafting, or participating in events. First championed in World of Warcraft, modern MMORPGs have started adopting similar Achievement Systems in their games to give players more things to do outside of questing and PVP.
In Tree of Savior, developers wanted character appearance to tie in with the game's Achievement System. Therefore, players must work to earn special character customizations such as hair color. Players can also earn titles to show off their accomplishments.
When a player earns a title, the title will be available on a separate title window. From there, a player can choose a title to equip onto their character.