The Predator Game Mode Add-on for Resident Evil 6 (Xbox 360) has 5 achievements worth 125 gamerscore.
Defeat Ustanak 20 times.
Defeat Ustanak without anyone on your team being captured.
Eliminate all players as Ustanak in less than a minute.
As Ustanak, capture a total of 50 humans.
Defeat Ustanak with only one Agent remaining.