The Legends and Killers Pack Add-on for Red Dead Redemption has 10 achievements worth 100 gamerscore.
Reach level 50 and pass into Legend.
Get 25 Dynamite kills with Pig Josh.
Get 25 Deadeye kills with Red.
Come back from a 2-0 deficit and win a Hold Your Own game.
Kill 5 players via headshot in a single Shootout or Gang Shootout.
Complete all Tomahawk challenges in Single Player.
Get a kill greater than 35 yards with a Tomahawk.
Double capture 3 times in a single Gold Rush map.
Get 3 kills with knives or throwing knives in a single competitive match.
Kill 3 or more players in a standoff or showdown.