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