Here is the full list of all 11 Toy Generals achievements.
Complete a level using only the "Shooters"
Complete a level using only the "Scout"
Complete a level using only the "Snipers"
Complete a level using only the "Medics"
Complete a level using only the "Machine-gunners"
Accept the challenge of Cowboy and win
Complete a level using only the "Grenadier"
Destroy 10 enemy soldiers
Destroy 100 enemy soldiers
Destroy 1000 enemy soldiers
Complete all levels with a result of 3 stars