In video gaming, an achievement (or a trophy) is a meta-goal defined outside a game's parameters, a digital reward that signifies a player's mastery of a specific task or challenge within a video game. Unlike the in-game systems of quests, tasks, and/or levels that usually define the goals of a video game and have a direct effect on further gameplay, the management of achievements usually takes place outside the confines of the game environment and architecture. Meeting the fulfillment conditions, and receiving recognition of fulfillment by the game, is referred to as unlocking the achievement. Source: Wikipedia (en)