Achievement experience is an alternate and additional experience system in EverQuest II. Achievement experience is earned in addition to normal experience (with all experience being converted to Achievement experience at the level cap). That achievement experience can be used to acquire special abilities and powers that allow you to customize your character.
Achievement experience is an alternate and additional experience system in EverQuest II. Achievement experience is earned in addition to normal experience (with all experience being converted to Achievement experience at the level cap). That achievement experience can be used to acquire special abilities and powers that allow you to customize your character. Many players refer to achievement experience points as "AAs" because of the original achievement ability system in EverQuest I. In EverQuest II, achievements are technically called "APs" (achievement points) but because of the prevalence of EQI players, "AA" seems to be the generally understood abbreviation. SoE's Achievement FAQ provides excellent information on achievement experience. Some important points are excerpted below.