Here is the full list of all 17 Toy Soldiers (GFWL) achievements worth 285 gamerscore. It takes around 12-15 hours to unlock all of the achievements.
Found all of the golden rockets in Invasion
Found all of the golden cubes in The Kaiser's Battle
Completed Campaign+ and earned all Ration Tickets
Defeated RoboBob
Earned General Rank on all Campaign levels
Earned a 40x blast combo
Defeated the K-Wagen
Survived until Round 5
Shot down 40 UFOs with your P-51 Mustang
Completed the Campaign
Completed a level in Elite mode
Defeated Uber Tank
Defeated Zeppelin
Guided a shell to its destination
Defeated Tsar Tank
Earned General Rank on a level
Completed level 1