Here is the full list of all 22 Chrome Wolf achievements worth 1,000 gamerscore.
Cleared the mission "Save the Prince".
Cleared the mission "Seize New Tank Model".
Cleared the mission "Join Southern Vanguard".
Cleared the mission "To the Rescue".
Cleared the mission "Prison Infiltration".
Cleared the mission "Lab Attack".
Cleared the mission "Infiltrate Reval".
Cleared the mission "Escort the Prince".
Cleared the mission "Develop New Arms".
Cleared the mission "Bait Rebel Forces".
Cleared the mission "Take Down Skyfort".
Cleared the mission "Stop the Invasion".
Cleared the mission "Tank Repair".
Cleared the mission "Join Military Exercise".
Cleared the mission "Giant Monster Purge".
Cleared the mission "Vanguard Ordinance".
Cleared the mission "Find the Traitor".
Cleared the mission "Sandworm Attack".
Cleared the mission "Defeat Unknown Species".
Cleared the mission "Explore Ancient Ruin".
Cleared the mission "Suppress Chimera Rampage".
Cleared the mission "Rescue the Hostage".