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.
Completed Campaign+ and earned all Ration Tickets
Earned a 40x blast combo
Defeated the K-Wagen
Found all of the golden cubes in The Kaiser's Battle
Earned General Rank on all Campaign levels
Defeated RoboBob
Found all of the golden rockets in Invasion
Shot down 40 UFOs with your P-51 Mustang
Survived until Round 5
Completed a level in Elite mode
Guided a shell to its destination
Completed the Campaign
Defeated Uber Tank
Defeated Zeppelin
Defeated Tsar Tank
Earned General Rank on a level
Completed level 1