This article introduces the Inventory of Creative Activities and Achievements (ICAA), a broad-based assessment of individual differences in real-life creativity. The ICAA provides independent scales for the frequency of engagement in everyday creative activity and the level of creative achievement across 8 creative domains. A formal test analysis based on 7 Little-C samples and 2 Pro-C samples (overall N = 1,566) provides evidence for the reliability and validity of the ICAA test scores. The analyses shed light on the prevalence of specific creative activity and achievement and examine the relevance of personality, creative potential, and intelligence across domains of creativity. The findings further suggest that the assessment of creative activity is particularly suited for Little-C creativity, whereas the assessment of creative achievement appears more appropriate for Pro-C creativity. The ICAA offers researchers a broad and versatile assessment tool for studying creativity across domains and levels.