This workshop addresses the development of teacher competencies for Education for Sustainable Development (ESD) and builds upon the learning experiences in the first of two periods of the Erasmus+ Teacher Academy EduSTA. By embracing different countries, educational cultures, contexts and needs, EduSTA aimed to cocreate a generic competence-based teacher role description, based on the current teacher competencies frameworks for ESD (Ametller, 2024), underpinning a prototype for micro-credentials, digital open badge-driven learning pathways and accompanying learning modules for teachers. The aim of the workshop is two-fold:1. Participants are actively involved in furthering the discussion on bringing sustainability education to life by negotiating the tensions and dilemmas in translating sustainability education concepts to teacher development practise. 2. Workshop hosts triangulate the tensions and dilemmas identified in the EduSTA badge-design process with the perspectives of educational stakeholders beyond the consortium. In a learning by doing process, participants in this workshop are presented with a set of educational design principles that foster ESD. In mixed groups they are invited to negotiate possibilities to make room for transformative learning, assessment as learning and communal and authentic learning while building upon the developed EduSTA badge constellation prototype, its competence objectives and criteria.