Here is the full list of all 17 Toy Soldiers achievements.
Complete Campaign+ and earn all Ration Tickets
Survive until Round 5
Defeat the K-Wagen
Get a 40x blast combo
Find all of the golden cubes in The Kaiser's Battle
Find all of the golden rockets in Invasion
Defeat RoboBob
Shoot down 40 UFOs with your P-51 Mustang
Earn General Rank on all Campaign levels
Complete the Campaign
Defeat Uber Tank
Defeat Zeppelin
Guide a shell to its destination
Complete any level in Elite mode
Defeat Tsar Tank
Earn General Rank on any level
Complete level 1