The Stasis Interrupted Add-on for Aliens: Colonial Marines has 10 achievements worth 250 gamerscore.
Complete Stasis Interrupted on any difficulty
Complete Stasis Interrupted on Ultimate Badass
Find All Stasis Interrupted Audio Logs
Find your family
Destroy the Legato
Sever the umbilical without missing a shot
Kill all the Lurkers in Sulaco engineering
Escape the FTL ship
Survive the Queen escape
Destroy all samples in the labs of the Queen module