The Gunstringer
70 Achievements
1,500
25-30h
Xbox 360
Real Big Shootin'
FINALLY shot a dog after a long series of shootouts.
25
How to unlock the Real Big Shootin' achievement in The Gunstringer - Definitive Guide
All you have to do for this one is play through the entire DLC once. There are 12 regular levels, and on the thirteenth one you get to fight the "boss". Just shoot him a few times with whatever weapon you're given, and the achievement should pop in the stats screen afterwards.
Story-related. Cannot be missed.
Play until the final round and shoot the dog to get this.