Swarm developer Hothead Games will be continuing the XBLA tradition of an awesome article of clothing and an awesome prop to go with your achievements. However, instead of some run-of-the-mill T-shirt, players of Swarm get an awesome hat with big buggy eyes! Fantastic. Not to mention a delightful looking Swarmite to keep you company. Not sure which achievements get them for you, but they both look absolutely delightful.
Photosource: Hothead Games