This achievement is unlocked by completing the Journeyman quest and by extension by becoming a Journeyman. This quest can only be done on a Beginner character, meaning you cannot choose a class at Prometheus.
To begin this quest, you must drop a peanut (recipe earned by completing the Picnic Stowaway's main quest) at an odd looking bush in the Carrotman zone. After this, you must complete the questline given to you to become a Journeyman.