The Siberian Strike Add-on for Sniper: Ghost Warrior 2 has 10 achievements worth 250 gamerscore.
Begin the hunt
Complete "Operation Siberian Strike"
Complete "It Takes Two"
Complete "Last Rites"
Get the train moving again
Complete the first interrogation
Complete the second interrogation
Complete the third interrogation
Sneak through the underground storehouse undetected
Collect all secrets in Siberian Strike campaign