Here is the full list of all 17 Toy Soldiers achievements.
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 Campaign+ and earn all Ration Tickets
Get a 40x blast combo
Earn General Rank on all Campaign levels
Survive until Round 5
Complete any level in Elite mode
Complete the Campaign
Defeat Uber Tank
Guide a shell to its destination
Defeat Zeppelin
Defeat Tsar Tank
Complete level 1
Earn General Rank on any level