Framework for Designing and Evaluating Game Achievements

Hamari and Eranti's framework proposes a design-independent model for game achievements, defining them as goals within a separate reward system whose fulfillment is triggered by events in the core game. The central thesis is that achievements possess a dual nature: they exist simultaneously within a meta-game layer and within the individual game where their conditions are met. The authors argue that this duality explains why earlier definitions and achievement compilations have often been inconsistent or disruptive to core gameplay, and that achievement systems should be understood as games in their own right, since players who pursue every badge no longer treat them as optional or secondary.

The framework rests on empirical observation of nine Steam titles (475 of 720 achievements completed), supplemented by examples from Xbox Live, Foursquare, World of Warcraft, Team Fortress 2, Left 4 Dead 2, and Call of Duty: Modern Warfare 2. Across these genres and platforms, the authors find a remarkably consistent structure. Each achievement comprises a signifier (name, icon, and often deliberately vague description), one or more completion logics (a trigger, pre-requirements, conditions, and a multiplier), and at least one reward. Triggers are distinguished as either player-invoked actions or system-invoked events.

A key contribution is the reclassification of rewards into three categories: meta-game rewards (such as achievement points), in-game rewards, and out-game rewards, replacing the conventional functional and non-functional split. The authors show that in-game aesthetic rewards can carry substantial social and competitive meaning even when they do not affect gameplay performance. The work is grounded in game studies and draws on research from motivation theory, gamification, and game design patterns, though its empirical base is limited to a relatively small sample of titles.