Replaying L.A. Noire ... this game does not age well.
Don't waste your breath that traitor hasn't been on Xbox in a while.
Achieve 8 medals on predator challenges - Batman: Arkham Asylum
Complete one predator challenge by using only Silent Takedowns and without being detected - Batman: Arkham Asylum
Defeat Titan henchman without using Batarangs (any play mode) - Batman: Arkham Asylum