An achievement (trophy on Playstation 3) is a reward given to players when they complete a notable gaming task in Xbox 360, Playstation 3, and some Windows games. The achievements system on Xbox 360 also bestows gamer points that count toward a gamer's total gamer score.
Hitman: Blood Money and Hitman: Absolution were the only two games which featured achievements (the latter featuring trophies), due to their availability on current generation consoles. However, Square Enix is releasing the Hitman HD Trilogy on January 29, 2013, which will bring remastered Hitman 2: Silent Assassin and Hitman: Contracts to the current generation consoles. With this advancement, achievements and trophies will be available for these games as well.