Need one more (or a) reason to get the AC/DC Rock Band expansion, achievement whores? You got one. The disc will be shipping with its own set of "unique" achievements, as well as - according to Harmonix - "several that are song specific". PS3 owners, same story, you'll get trophies. Presumably (hopefully?) one of them will be for nailing the piggish "oi! oi! oi!" in TNT.